iwahara

Hiroshi Iwahara

Do you know the product "CUBI" ? It was made by my boss, whom I greatly respect, Mr. Akio Kamei. It's a CUBE box that has BINARY motion. It's one of the most difficult Karakuri to open. I was impressed by this box, and was determined to create Karakuri. Complex mechanisms and simple expressions produce functional beauty. I'll create those products.

1973．Born in Fukushima Prefecture
1997．Graduated from Saitama University
1999．Graduated from Nagano Prefecture Matsumoto Woodwork Technical College
Participated in Karakuri Creation Group

Hiroshi Iwahara Web site

This page is only for explanation of products.
This isn't a stock list.
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PRODUCT	ITEM	INFORMATION
Aquarius Box (small)	RF-66	This work was designed as a Christmas present for 2019. This is an applied work of the “Aquarius Drawer” (RF-55). Six plates are divided into three plates. All three plates have the “Aquarius” movement. There are two compartments. Only three plates are linked. This has a moderate difficulty level. Each basic movement is 13 times. But, for the second compartment, at first, the plate won’t move at all. Please find a byway. Created : 11/2019 Size (box body) : 82×82×82 mm Size (storage part) : ***** Material : ichii, movingui, padoauk
Aquarius Drawer 2	RF-65	This work was designed for Karakuri Puzzle Party in Hakone 2019. It’s developed version of “Aquarius Drawer”. Each device moves in 5 steps. 5 devices move in intertwining. First drawer opens at 5 step. Second drawer opens at 241 step. Each maze was designed by shortening the maze of Quinary box, or adding corners at both end of the maze of Trinary box. The formula is “3 to the 5th power minus 2”. 5 means the number of devices. In case of 6 devices, it’s 727 step. In case of 7 devices, it’s 2185 step. I have not experimented yet. Not bad. By the way, the formula of initial “Aquarius Drawer” is “2 times 2 to the 5th power minus 3”. Created : 09/2019 Size (box body) : 135×180×76 mm Size (storage part) : 27×33×23 mm mm Material : wendge, maple, metal pin
Roll Dance Drawer	RF-64	This work was designed for an exhibition with the theme, “WA”. There are 2 white layers of Rings. When you move the rings correctly you will be able to open the drawer. There are 8 arrangements depending on the position of the 2 Rings. There are several ways of opening it. But, when you go through the shortest routes, the Rings move like a dance. This item was designed as a developed version of RF-16 “Covered Chimney”. Created : 03/2019 Size (box body) : 117×117×87mm Size (storage part) : 80.5×80.5×24 mm Material : padoauk, maple, keyaki (zelkova), magnolia
Box with 5 trees	RF-63	This work was designed as a Christmas present for 2018. One by one you slide each tree-plate in turn. The only plate without a tree is the goal. As you slide each plate in the correct order, you will begin to feel that you can open the final lid. But it’s not that easy! This is an item using gravity, such as, “Box with a tree” in 2005, and “House with trees” in 2010. If you know these products you may be able to manipulate the puzzle more easily. Created : 11/2018 Size (box body) : 83 x 83 x 83mm Size (storage part) : 40 x 40 x 43 mm Material : magnolia, movingui, acrylic board
Visible 5-Ary Drawer (Quinary)	RF-62	This work was designed for Karakuri Puzzle Party in Hakone 2018. “Is it possible to make items of system such as Binary or Ternary with a very clear design?” I wondered about this so I decided to try and see if I could do it. There are only 3 “drawers”. It is the minimum number that we need to fully enjoy the system. There are only 2 devices. When you have solved the puzzle, you can finally open the bottom drawer. The mechanism used for RF-38 “Canon Chest” was used. This is a drawer of Quinary system. It takes 50 moves to open (except for opening the lid). When all the 3 “drawers” are opened, you can open the bottom drawer. The number of moves has increased in this work. As might be expected, it will take time to solve this item. The formula to calculate the number of moves is “552=50”. Well, how about the formulas of other items? Created : 08/2018 Size (box body) : 79 x 87 x 75mm Size (storage part) : 17 x 44 x 70 mm Material : walnut, wendge, padoauk, maple, acrylic board
Visible 4-Ary Drawer (Quaternary)	RF-61	This work was designed for Karakuri Puzzle Party in Hakone 2018. “Is it possible to make items of system such as Binary or Ternary with a very clear design?” I wondered about this so I decided to try and see if I could do it. There are only 3 “drawers”. It is the minimum number that we need to fully enjoy the system. There are only 2 devices. When you have solved the puzzle, you can finally open the bottom drawer. The mechanism used for RF-38 “Canon Chest” was used. This is a drawer of Quaternary system. It takes 32 moves to open (except for opening the lid). When only the left “drawer” is opened, you can open the bottom drawer. You can find the “Comb”-shaped groove that also appeared on the RF-28 “KING CUBI” device. At first glance, the groove looks like it is a shortcut. And as you move the parts it works well. Please experience the wonder. Created : 08/2018 Size (box body) : 79 x 87 x 75mm Size (storage part) : 17 x 44 x 70 mm Material : walnut, wendge, padoauk, maple, acrylic board
Visible 3-Ary Drawer (Ternary)	RF-60	This work was designed for Karakuri Puzzle Party in Hakone 2018. “Is it possible to make items of system such as Binary or Ternary with a very clear design?” I wondered about this so I decided to try and see if I could do it. There are only 3 “drawers”. It is the minimum number that we need to fully enjoy the system. There are only 2 devices. When you have solved the puzzle, you can finally open the bottom drawer. The mechanism used for RF-38 “Canon Chest” was used. This is a drawer of Ternary system. It takes 18 moves to open (except for opening the lid). When all the 3 “drawers” are opened, you can open the bottom drawer. RF-4 “Super-CUBI” has 6 sides, and it has many more moves. In fact, only 2/3 of the performance is used. But, the performance is fully utilized on this item. The maximum moves are 3 “drawers”. Created : 08/2018 Size (box body) : 79 x 87 x 75mm Size (storage part) : 17 x 44 x 70 mm Material : walnut, wendge, padoauk, maple, acrylic board
Visible 2-Ary Drawer (Binary)	RF-59	This work was designed for Karakuri Puzzle Party in Hakone 2018. “Is it possible to make items of system such as Binary or Ternary with a very clear design?” I wondered about this so I decided to try and see if I could do it. There are only 3 “drawers”. It is the minimum number that we need to fully enjoy the system. There are only 2 devices. When you have solved the puzzle, you can finally open the bottom drawer. The mechanism used for RF-38 “Canon Chest” was used. This is a drawer of Binary system. It takes 8 moves to open (except for opening the lid). When only the left-side “drawer” is opened, you can open the bottom drawer. I think this item may be the easiest item to understand the binary method. When you maneuver this while looking at the window, you will understand the binary method easily! Created : 08/2018 Size (box body) : 79 x 87 x 75mm Size (storage part) : 17 x 44 x 70 mm Material : walnut, wendge, padoauk, maple, acrylic board
Drawer of Stepping Monument	RF-58	This work was designed for an exhibition that theme is “Travel”. All of the beautiful Yosegi is actually part of the Karakuri. The design perspective is of the viewpoint taken from above and looking down. The shape of the cube and the corresponding position is the hint to opening the drawer. The design and Karakuri were linked in a virtual image. The title is from the Yosegi of RF-8. On the design, Yosegi was used as the device. So, if you move the device while regarding them as islands, it may be helpful if you think of the tour of the islands at Matsushima, Miyagi, a tourist spot. Created : 03/2018 Size (box body) : 160×170×66 mm Size (storage part) : 120×110×30 mm Material : walnut, magnolia, padauk, keyaki, etc.
Another Aquarius Drawer (Aquarius Drawer 2)	RF-57	This work was designed as a Christmas present for 2017. The Christmas present for the previous year, RF-49 “Bean Bag Drawer 3 (Cat's bell)” was somewhat difficult to solve. So, this year, I tried to use a simpler idea. There are two spaces in the drawer. The second space is locked. When you move the device on the top with the drawer, you may figure out how to solve it. The gimmick is different from RF-55 “Aquarius Drawer (5 devices)”, but, I intentionally used the same name. This might be one of the clues to solving it. Created : 11/2017 Size : 72×129×60 mm Material : Japanese raisin tree, padauk, magnolia, wendge, keyaki
Ninomiya Yosegi Secret Box	RF-56	“Make a Secret Box with Ninomiya’s method and quality.” This was the goal. He made Secret Box for the first time in 20 years since he started woodworking. He asked Ninomiya the method many times. Hand plane was often used. At first, he tried to sharpen the hand plane well. It took around 3 months to make. Of course, it was made by “Denshou-Zukuri” to hide the bar well. It was hand-painted. Yosegi was offered by Ninomiya. The size is 5 sun, and it is 7 move. If he had made a standard Secret Box, he probably wouldn’t have had any difficulties like this time. Created : 09/2017 Size : 95×150×60 mm Material : katsura, magnolia, ancient katsura, etc.
Aquarius Drawer (5 devices)	RF-55	This work was designed for an exhibition that theme is “Story”. The motif is the horoscope sign for Aquarius. Each device moves in 4 steps, and the 5 devices are intertwined. The motion seems both regular and irregular. The first drawer opens at step 5, and the second drawer opens at step 61. The maze on each device is common. It was designed by shortening the maze of Quaternary box. The overlapping devices when viewed from above, control each other. It’s still possible to connect more devices to this work. The craftsman who made this had a discussion with Kagen Sound in 2014, and this new idea came to him. Well, is your Aquarius story happy or sad? Created : 03/2017 Size : 132×176×72 mm Material : bubinga, keyaki, metal pin
＜Link Type Box Series＞	RF-50～ RF-54, RF-39-2	Confetto Box (RF-39) was developed systematically. A different maze was made on the same structure. The top links with the 4 sides. The bottom is the lid. The 4 side plates work with each other. The movement is only opening and closing, with no relation between the opposite sides, and only the top and sides link. In order to achieve these movements, I arrived at these designs. Created : 01/20167 Size : 82 x 82 x 82 mm　(Except Yosegi) Material : magnolia, senn(castor aralia), metal pin
Link Type Box (Basic)	RF-54	Among the Link Type Box series, this has the most basic movement. I recommend this design to beginners. When you move the four side plates in order to make a round, you have accomplished the goal. Of course, the top plate links, so it can’t be easy. You will be able to taste the real pleasure of Link Type well enough though. The total number of steps takes 13, and the extracted number of side movemenst is 4. Dare to say, this is a kind of “Straight Type”. Created : 01/20167 Size : 82 x 82 x 82 mm　(Except Yosegi) Material : magnolia, senn(castor aralia), metal pin
Link Type Box (Grace)	RF-39-2	Among the Link Type Box series that is considered relatively advanced works, this movement may be the most beautiful. The total number of steps is 21, and extracted number of side movements is 7. This is a kind of “Turning Type” of puzzle. The route to solve it turns one time. The image of the movement was a Rainbow. This design was used for the Christmas Present in 2014. Created : 01/20167 Size : 82 x 82 x 82 mm　(Except Yosegi) Material : magnolia, senn(castor aralia), metal pin
Link Type Box (Advanced Branch)	RF-53	This is a kind of “Branch Type” puzzle. This is an advanced version of “Branch Type”. This puzzle has the third highest number of steps at 23, and extracted number of side movements is 9. The movement route is like something that has its timing out of sync. It looks complex and interesting. It was a surprise to be able to design an advanced version of “Branch Type”. Created : 01/20167 Size : 82 x 82 x 82 mm　(Except Yosegi) Material : magnolia, senn(castor aralia), metal pin
Link Type Box (Shortcut)	RF-52	This is a kind of “Branch Type” puzzle. The route is symmetrical. The movement is standard as a “Branch Type”. But, an advanced Secret Shortcut technique is possible. The total number of steps is 21(normal), and extracted number of side movements is 7. In case you succeed at finding the Shortcut, the total number of steps will be reduced to 17. Though it might be more difficult… When I found the Shortcut skill I was excited and remembered NES. Created : 01/20167 Size : 82 x 82 x 82 mm　(Except Yosegi) Material : magnolia, senn(castor aralia), metal pin
Link Type Box (Silver with Dummy)	RF-51	This is the only design that has a dummy movement among this series. The Dummy was made unavoidably due to structural reasons, but, it plays a big role later. This design may have the second highest number of steps. The total number of steps is 25, and extracted number of side movements is 10. This is a kind of “Turning Type” and takes 3 turns to solve. Created : 01/20167 Size : 82 x 82 x 82 mm　(Except Yosegi) Material : magnolia, senn(castor aralia), metal pin
Link Type Box (Max)	RF-50	Maybe this design has the maximum number of steps to open. The total number of steps is 31, and the extracted number of side movements is 11. This is a kind of “Turning Type” puzzle and takes 3 turns to solve it. Will you see more of this kind of movement design in the future? Created : 01/20167 Size : 82 x 82 x 82 mm　(Except Yosegi) Material : magnolia, senn(castor aralia), metal pin
Bean Bag Drawer 3　（Cat's bell）	RF-49	This work was designed as a Christmas present for 2016. This is a developed version of “Bean Bag Drawer”. It is the third item in this series. The goal is to find the hidden deep inner space of the drawer. It’s a bit difficult, but when you rotate the dial, you can open the second space. But, the dial on the top does not move. Please feel the subtle resistance of the spring, and combined movement of the drawer and the red plate. Created : 11/2016 Size : 78 x 132 x 66mm　 Material : walnut, padoauk, maple, magnolia, etc., torsion spring
Sharp Roof House	RF-48	An action of the development of “House Collection” Series started. The motifs are houses and buildings. The aim is new style Karakuri box that is suitable to display or to put treasure inside. Basically, the Karakuri device is hidden in the design. This is a suggestion about new direction of Karakuri products. And, these items image “TAKUMI-KAN” that is a shop of wooden items in Odawara. This is the sixth item of House Collection. To say about Karakuri Box, when we got a new idea, we sometimes can not know how difficult to open it is for customers before making. How will the degree of the delicate tightness of the device influence it? How does the customers hold the box naturally? After all, we can not know it until we finish making. This item became one of such items. 　 Created : 09/2016 Size : 60 x 78 x 90 mm Material : maple, padauk, magnolia, cotton velvet
Four Color Palace	RF-47	An action of the development of “House Collection” Series started. The motifs are houses and buildings. The aim is new style Karakuri box that is suitable to display or to put treasure inside. Basically, the Karakuri device is hidden in the design. This is a suggestion about new direction of Karakuri products. And, these items image “TAKUMI-KAN” that is a shop of wooden items in Odawara. This is the fifth item of House Collection. You can choose one color among four colors about the color of the windows. You need to solve this box to change the color. The cause of the imagination was House-shaped candlelight. A light leaks out from the window of the candlelight. It is very fantastic. How can I reappear the atmosphere as a wooden Karakuri Box, without using the light? The designing of this item was not easy. But, it was very exciting time. 　 Created : 08/2016 Size : 82 x 82 x 72 mm Material : maple, karin, wendge, keyaki (zelkova), magnolia, cotton velvet
Design Housing	RF-46	An action of the development of “House Collection” Series started. The motifs are houses and buildings. The aim is new style Karakuri box that is suitable to display or to put treasure inside. Basically, the Karakuri device is hidden in the design. This is a suggestion about new direction of Karakuri products. And, these items image “TAKUMI-KAN” that is a shop of wooden items in Odawara. This is the fourth item of House Collection. It is imaged a latest Design House. The device is hidden in the design. When you play with this item, you will not feel difficult to open. But, it can be difficult to find the solution from the appearance. It took double days in the production of the first lot. And then some kind of changes will be needed in the next production. 　 Created : 08/2016 Size : 75 x 70 x 72 mm Material : maple, walnut, wendge, cotton velvet
Oops House	RF-45	An action of the development of “House Collection” Series started. The motifs are houses and buildings. The aim is new style Karakuri box that is suitable to display or to put treasure inside. Basically, the Karakuri device is hidden in the design. This is a suggestion about new direction of Karakuri products. And, these items image “TAKUMI-KAN” that is a shop of wooden items in Odawara. This is the third item of House Collection. The House inclines. It seems to put the head on one side. There is a drawer inside. Of course, it is usually locked. However, you will be able to open it by doing a certain normal operation. The device which is used for this item is not newest one. But the device is relatively high level. This is an item that we can enjoy the device easily. Created : 07/2016 Size : 60 x 80 x 70mm Material : maple, cotton velvet
Windmill	RF-44	An action of the development of “House Collection” Series started. The motifs are houses and buildings. The aim is new style Karakuri box that is suitable to display or to put treasure inside. Basically, the Karakuri device is hidden in the design. This is a suggestion about new direction of Karakuri products. And, these items image “TAKUMI-KAN” that is a shop of wooden items in Odawara. This is the second item of House Collection. As a result, the device of this item is going to become the simplest among this series. The appearance became like this to make big inside space as much as possible, though this item itself is small. Now, when I finished making the first lot, I also have the feeling that I want to make with the sharper appearance in the next time. Created : 07/2016 Size : 68 x 68 x 70 mm (height is without sail) Material : walnut, senn(castor aralia), padauk, cotton velvet
Church	RF-43	An action of the development of “House Collection” Series started. The motifs are houses and buildings. The aim is new style Karakuri box that is suitable to display or to put treasure inside. Basically, the Karakuri device is hidden in the design. This is a suggestion about new direction of Karakuri products. And, these items image “TAKUMI-KAN” that is a shop of wooden items in Odawara. This is the first item of House Collection. There is a drawer behind it. But, there is no handle on it. Well, how do you enter the church? It requires only one operation to open. 　 Created : 07/2016 Size : 60 x 80 x 84 mm Material : maple, padauk, walnut, cotton velvet
Super-CUBI (small)	RF-4-12	This Super-Cubi (small) was designed smaller than the original one. It takes 324 moves to open. 　 Created : 09/2016 Size : 77×77×77 mm Material : Shiuri Cherry, zebra wood, stainless steel
STAR with a single stroke	RF-42	This work was designed for an exhibition that theme is “Space”. You will be able to open the center box only when you move the five devices along each side in correct order. The hint of the order is cleverly hidden in the design of the inlay. It is an interesting item for the development of Karakuri. Generally, mechanisms that require one specific order to solve them tend to be complicated. This item is no exception. It may be said that the mechanism of this item is like a developed one of “Unusual Slot” (M-13) by Kamei. Created : 04/2016 Size : 215×215×74 mm Material : magnolia, walnut, maple
Bean Bag Drawer 2	RF-41	This work was designed as a Christmas present for 2015. This is a developed version of “Bean Bag Drawer (RF36)” that was designed in 2013. The goal is to find the hidden deep inner space of the drawer. You should move the four white plates in correct order. Of course, it’s not quite that simple to open – you also need to consider other ways it all fits together. When you feel the spring start to shift, you will know that you have successfully found the inner box. Created : 11/2015 Size : 93×93×135 mm Material : walnut, oak, maple, bubinga, magnolia, etc.
Super-CUBI (the trinary system box)	RF-4-11	This is a remake of Super-CUBI. Two surface plates are on opposite sides of each other; #1 and #2, #3 and #4, #5 and #6. Created : 09/2015 Size : 131 x 131 x 131 mm Material : shiuri cherry, walnut, etc.
Two-dimensional Secret Box	RF-40	This work was designed for an exhibition that theme is “Two”. Of course, a normal Secret Box is a three-dimensional item. This item was expressed in two-dimensions. Even if the structure is made in two-dimensions, the inner space disappears. On the other hand, if it is made in three-dimensions, it becomes a normal Secret Box. Therefore, a structure that seems like it is between two-dimensions and three-dimensions was adopted. What does it mean? You will understand the Secret when you open it. Created : 04/2015 Size : 200 x 170 x 60 mm Material : sophora japonica, Japanese raisin tree, katsura, etc.
Secret Base　（rengas)	RF-18-13	This is a remake version. The materials were changed. The trick is same. Created : 02/2015 Size : 90×90×67 mm Material : oak, walnut, ancient katsura, rengas
Secret Base　（WN)	RF-18-12	This is a remake version. The materials were changed. The trick is same. Created : 02/2015 Size : 90×90×67 mm Material : oak, walnut, ancient katsura
Secret Base　（M)	RF-18-11	This is a remake version. The materials were changed. The trick is same. Created : 02/2015 Size : 90×90×67 mm Material : oak, walnut, ancient katsura, etc.
Confetto Box 2	RF-39	This work was designed as a Christmas present for 2014. This work was designed as a Christmas present for 2014. This is a developed version of “Confetto Box” that was designed in 2008. The original “Confetto Box” was solved by using 2 plates in a special way. This time, you can use the same method to open. But, you need another idea to open. Or, we had better to say that you need two more ideas? There in only one compartment inside. 　 Created : 11/2014 Size : 80 x 80 x 80 mm Material : magnolia, teak, metal pin
Canon Chest	RF-38	This was made based on a special order. There are many Karakuri inside. Memory System(RF-13), it’s Control Panels, Flue Pipes, Wind Control Boxes (boxes to make one way wind by both movement of opening and closing the drawers), Final Secret Drawer (it will be unlocked by a certain melody), A Door that will be unlocked by 8 step 2-ary (Binary) movement of drawers, A Door by 18 step 3-ary, A Door by 32 step 4-ary, and A Door by 50 step 5-ary. This item was ordered and designed under the influence of an item by Kagen Sound who applied a pipe organ to a puzzle in 2011. Created : 09/2014 finished, (designing started from 2012) Size : 1840x 870x 1600 mm Material : Amboyna burl, Yanase Cedar, Shiuri Cherry, etc. Furniture Craftsman: Yukio Ogura
Super-CUBI (small)	RF-4-10	This Super-Cubi (small) was designed smaller than the original for special entry into the global ‘Apothecary Puzzle Project’. It involved 12 participants from 5 countries coordinated by Dave COOPER in Australia, with the carcass made by Robert YARGER in USA. In this small version some components were made from metal in order to accommodate the difficulty in making it this small. 　 Created : 01/2012 Size : 76x 76x 76 mm Material : birch, walnut, stainless steel, others
Antique Radio	RF-37-1	This work was designed for an exhibition that theme is “Nostalgic”. There are two compartments inside. One is under the speaker, and another is under the tuning meter. Please unlock each space with three dials. Each space unlocks differently. Please observe the radio carefully, and use that as a hint. 　 Created : 03/2014 Size : 160x 126x 88 mm Material : walnut, magnolia, etc.
Antique Radio	RF-37-2	This work was designed for an exhibition that theme is “Nostalgic”.This work is basically the same as RF-37-1. The difference is the position of the speaker and the tuning mater. When RF-37-1 was produced, only two copies of RF-37-2 were produced at the same time. 　 Created : 03/2014 Size : 160x 126x 88 mm Material : walnut, magnolia, etc.
Bean Bag Drawer	RF-36	This work was designed as a Christmas present for 2013. The drawer is partitioned off. It is easy to open out halfway. Please open the drawer completely by moving the two devices. This work was named for the image of the solution by the craftsman. That might be your hint. 　 Created : 11/2013 Size : 81x 117x 60 mm Material : walnut, magnolia, keyaki (zelkova), rengas
Another binary drawer	RF-35	The “binary” is used by different way until now. This way may be more primitive usage. Unlock the drawers by moving the bars. To see the number of 3 and 8 did you get a hint? Each bar means each place of binary. When a bar is opened, it means 1, and a bar is closed, it means 0. Each drawer means 0, 1, 2, ….and 7. “Move up of digit” is expressed more exactly. Similar mechanism will be possible at trinary and others. But, more than at least 18 drawers must be made in case of trinary… This work was designed for an exhibition theme of "palpitate". Created : 03/2013 Size : 139x 246x 69 mm Material : waｌnut, zebra wood, Magnolia, maple, birch, padoauk
Half-finished box	RF-34	This work was designed as a Christmas present for 2012. There are two compartments inside like RF-22. There is an A mark inside the first compartment and a B mark inside the second compartment. A is easy to open, but B is not. The idea of this trick is not the newest, but it was arranged systematically as a cube so that all the 6 aspects move. Created : 12/2012 Size : 85 x 85 x 85 mm Material : ancient keyaki
Super-CUBI (the trinary system box) <race wood>	RF-4-7	This is a remake version of Super-CUBI. To say about the surface plate, #1 and #2, #2 and #3, …#5 and #6 are neighbors each other. Created : 09/2012 Size : 131 x 131 x 131 mm Material : walnut, race wood
Super-CUBI (the trinary system box) <birds eye maple>	RF-4-8	This is a remake version of Super-CUBI. To say about the surface plate, #1 and #2, #2 and #3, …#5 and #6 are neighbors each other. Created : 09/2012 Size : 131 x 131 x 131 mm Material : walnut, bird eye maple
Super-CUBI (the trinary system box) <Yosegi>	RF-4-9	This is a remake version of Super-CUBI. To say about the surface plate, #1 and #2, #2 and #3, …#5 and #6 are neighbors each other. Created : 09/2012 Size : 131 x 131 x 131 mm Material : walnut, keyaki (zelkova), etc.
Wave Box (with a crayon)	RF-33	This work was designed for an exhibition that theme was "living". There are 17 pieces of plates on the top of this work. Each plate works freely. While you open the drawer, the each plate will make an interesting move. The crayon put up in the edge of the work is a key of the drawer. This work isn’t difficult to open. What kind of image will be drawn with the crayon? 　 Created : 03/2012 Size : 66×168×66 mm Material : walnut, oak, padoauk
Box with a tree （keyaki < zelkova >)	RF-14-3	These are the remake version of the “Box with a tree”. The materials of the surface board were changed. As many of you know, the side plates must move in a special way. For this reason, more experienced skills are needed. The side plates were made somewhat loosely. Created : 02/2012 Size : 117×81×62 mm Material : keyaki (zelkova), katsura, acrylic board
Box with a tree　（chanchin）	RF-14-6	This is the remake version of the “Box with a tree”. The materials were changed. The trick is same. 　 Created : 02/2012 Size : 117×81×62 mm Material : chanchin, katsura, acrylic board
Box with a tree　（sophora）	RF-14-7	This is the remake version of the “Box with a tree”. The materials were changed. The trick is same. 　 Created : 02/2012 Size : 117×81×62 mm Material : sophora japonica, katsura, acrylic board
Secret Base　（B)	RF-18-8	This is a remake version. The materials were changed. The trick is same. Created : 02/2012 Size : 90×90×67 mm Material : oak, walnut, ancient katsura, etc.
Secret Base　（R)	RF-18-9	This is a remake version. The materials were changed. The trick is same. Created : 02/2012 Size : 90×90×67 mm Material : oak, walnut, ancient kastura, etc.
Secret Base　（Y)	RF-18-10	This is a remake version. The materials were changed. The trick is same. Created : 02/2012 Size : 90×90×67 mm Material : oak, walnut, ancient katsura, etc.
Secret Base 2	RF-32	This work was designed as a Christmas present for 2011. This is a “Sisters work” of “Secret Base” (RF-18). The second compartment of the RF-18 is opened by a special operation. This work will be opened by same way. But, at first, you can’t do the operation.　You need a new idea to do the special operation. There is only one compartment inside. Created : 11/2011 Size : 90×90×75 mm Material : oak, walnut, birch, bubinga, others
Sliding 3 Drawer Chest (White)	RF-24-3	RF-24 was reproduced. The mechanism is same as the previous RF-24. You can unlock the drawers by sliding the body. The size became a little bigger. It became easy to make a little. The material was changed to oak. The oak is hard and you will feel that the work is solid and stable. The front design was also changed. 　 Created : 10/2011 Size : 128×138×153 mm Material : oak, chestnut, corner stick of brass, and etc.
Sliding 3 Drawer Chest (Yellow)	RF-24-4	RF-24 was reproduced. The mechanism is same as the previous RF-24. You can unlock the drawers by sliding the body. The size became a little bigger. It became easy to make a little. The material was changed to oak. The oak is hard and you will feel that the work is solid and stable. The front design was also changed. 　 Created : 10/2011 Size : 128×138×153 mm Material : oak, chestnut, corner stick of brass, and etc.
Firewood	RF-31	This work was designed for an exhibition that theme was "forest". The motif is firewood for fireplace. The trick is simple. When you move the trick, a drawer will come out. This motif "Firewood" was a trial for the craftsman. Over ten kinds of woods were used for this work. The materials are from all over the world. The work became a colorful work. 　 Created : 04/2011 Size : 128×98×93 mm Material : katsura, oak. rosewood, and others (more than 10 kinds)
Chiyo-Musubi	RF-30	When we tie up a belt or paper tape well, a knot that is called "Chiyo-Musubi" is completed. In Japan, it is said to be a lucky knot. We can see it as a Chopsticks bag, and others. The craftsman wanted to make a work based on this shape. It has 19 moves, and the movements cross each other. It was much more difficult to make than expectation. Well, the shape of this "Chiyo-Musubi" is a Pentagon. But, it is also possible to make a Heptagon. Though, there is no plan to make it as a Karakuri work! 　 Created : 04/2011 Size : 237×128×72 mm Material : walnut, oak, angsana
Secret Base （maple (birds eye))	RF-18-5	This is a remake version. The trick is same. The middle layer was made with a newly devised structure. The reason is to stable the layer as much as possible. The center part like a knob was also devised. Some customers put it upside down while playing. In fact, this how to put was unrelated to the solution. But, with this as a hint, at the copies of this time, it is related to the solution a little. This is by a slight playfulness. 　 Created : 03/2011 Size : 90×90×67 mm Material : shiuri cherry, oak, katsura, walnut, rose wood, maple (birds eye)
Secret Base （race wood)	RF-18-6	This is a remake version. The trick is same. The middle layer was made with a newly devised structure. The reason is to stable the layer as much as possible. The center part like a knob was also devised. Some customers put it upside down while playing. In fact, this how to put was unrelated to the solution. But, with this as a hint, at the copies of this time, it is related to the solution a little. This is by a slight playfulness. 　 Created : 03/2011 Size : 90×90×67 mm Material : shiuri cherry, oak, katsura, walnut, rose wood, race wood
Secret Base （zebra wood)	RF-18-7	This is a remake version. The trick is same. The middle layer was made with a newly devised structure. The reason is to stable the layer as much as possible. The center part like a knob was also devised. Some customers put it upside down while playing. In fact, this how to put was unrelated to the solution. But, with this as a hint, at the copies of this time, it is related to the solution a little. This is by a slight playfulness. 　 Created : 03/2011 Size : 90×90×67 mm Material : shiuri cherry, oak, katsura, walnut, rose wood, zebra wood
Box with a tree (bubinga)	RF-14-4	These are the remake version of the “Box with a tree”. The materials of the surface board were changed. As many of you know, the side plates must move in a special way. For this reason, more experienced skills are needed. The side plates were made somewhat loosely. Created : 01/2011 Size : 117×81×62 mm Material : bubinga, katsura, acrylic board
Box with a tree (lacewood)	RF-14-5	These are the remake version of the “Box with a tree”. The materials of the surface board were changed. As many of you know, the side plates must move in a special way. For this reason, more experienced skills are needed. The side plates were made somewhat loosely. Created : 01/2011 Size : 117×81×62 mm Material : lacewod, katsura, acrylic board
House with trees	RF-29	This work was designed as a Christmas present for 2010. Do you know how to solve the "Box with a tree"? If you know how, then that becomes a hint. You can move the 4 plates freely. But, the top plate won't open. There are 4 trees on the top. The direction of the trees are a hint in solving the box. Created : 11/2010 Size : 78×78×57 mm Material : false acacia, walnut, magnolia, angsana, keyaki (zelkova), zebra wood, ichii, acrylic boad, etc.
KING CUBI	RF-28	This is the so-called "Quaternary Box". It takes 1536 moves to open. About ten years has passed since the creation of "Ternary Box". It was designed for the International Puzzle Meeting of 2010. “Binary Box” has a “U”-shaped groove for the trick. The “Ternary Box” has an “S”-shaped groove. Therefore, since the creation of “Ternary Box”, the designer thought that the "Quaternary Box" could have an “M”-shaped groove somehow. But, in fact, the "Quaternary Box" also needed a groove that is shaped like a “Comb”, not only an “M”-shaped groove. “U”-shaped groove, “S”-shaped groove and “M”-shaped groove have no branches. So, I will call the grooves like them as “Snake”-shaped grooves. On the other hand, I call the groove that is just like “Comb”, “Comb”-shaped groove. Thus, it is expected that an “Even Number Notation Box” is made of “Snake”-shaped grooves and “Comb”-shaped grooves, and an “Odd Number Notation Box” is made of only “Snake”-shaped grooves. Created : 07/2010 Size : 188×188×188 mm Material : shiuri cherry, angsana, maple, zebrawood, keyaki, stainless steel,
Byway Secret 4	RF-27	This is the 4th type of the Byway Secret series. There are two compartments inside. Please try to find the second compartment. It takes 6 moves to open. This work was designed for an international puzzle event that was held in 2010. Only about 10 copies were produced for Karakuri Club members. 　 Created : 04/2010 Size : 52×68×45 mm Material : magnolia, walnut, maple (birds eye)
Byway Secret 4-2	RF-27-2	This work has the same mechanism as the RF-27. The material of the top plate was changed from maple (birds eye) to zebra wood. Created : 09/2010 Size : 52×68×45 mm Material : magnolia, walnut, zebra wood
Three color DANGO	RF-26	“Three-color DANGO” equals three lines. The turn of the each DANGO’s color is different from the other. You can move each “Three-color DANGO”right or left. There are three drawers in the lower part. All the drawers are locked. The front boards of the drawers are colored the same as DANGO. Now, maybe you’ve already figured out how to play with this work. By moving each “Three-color DANGO”, please unlock the drawers. From a structural perspective, the drawers come out only 18 millimeters. Then, please take the front board off for the top. Oops. Don’t replace the front boards! 　 Created : 01/2010 Size : 117×174×73 mm Material : walnut, ichii, magnolia, mizuki(dogwood), birch
4 Direction Drawer	RF-25	This work was designed as a Christmas present for 2009.There are 4 drawers. The direction of the drawers are all different from each other. Only the very bottom drawer isn't locked. When you move the drawers in a special way, you will be able to open the drawers in sequence. The goal is to open all the drawers at the same time. A mechanism called, "prevention of countercurrent" was needed to make this work. The device is fitted only between drawers next to each other. Therefore, it is possible to make a work that has 5, 6 and even more drawers, by piling up the same drawers in this work. This work has a similar mechanism to that of RF-22 "Confetto Box". Created : 10/2009 Size : 106×106× 115mm Material : oak, walnut, karin, camphor tree, rose wood
Secret Base (Ｙellow)	RF-18-3	It is a remake version of the “Secret Base”. Only the material of the surface plates are different. The four plates of the surface are made of same color wood. The appearance became simple and refreshing. Created : 12/2009 Size : 90×90×64 mm Material : shiuri cherry, katsura, oak, walnut, ancient katsura, keyaki(zelkova)
Secret Base　(Ｖermilion)	RF-18-4	It is a remake version of the “Secret Base”. Only the material of the surface plates are different. The four plates of the surface are made of same color wood. The appearance became simple and refreshing. Created : 12/2009 Size : 90×90×64 mm Material : shiuri cherry, katsura, oak, walnut, ancient katsura, karin
Sliding 3 Drawer Chest (Red)	RF-24-1	At first, you can't open the drawers at all. When you slide the drawers each other well, you will be able to unlock the key. Eight years has passed, since the RF-5 "Sliding 4 Drawer Chest" was designed. Finally, it was manufactured. The drawer was reduced from four to three, to cut the cost. The distance between upper drawer and lower drawer became near. Therefore, it became easier to make the mechanism comparatively Created : 05/2009 Size : 120×130×150 mm Material : amur corktree, chestnut, brass, etc.
Sliding 3 Drawer Chest (Black)	RF-24-2	At first, you can't open the drawers at all. When you slide the drawers each other well, you will be able to unlock the key. Eight years has passed, since the RF-5 "Sliding 4 Drawer Chest" was designed. Finally, it was manufactured. The drawer was reduced from four to three, to cut the cost. The distance between upper drawer and lower drawer became near. Therefore, it became easier to make the mechanism comparatively 　Ｃreated : 05/2009 Size : 120×130×150 mm Material : amur corktree, chestnut, brass, etc.
flower	RF-23	This work was designed for the exhibition theme of “spring”. The motif is a Japanese traditional lunch box. There is an acrylic window board on top. You can see four pieces of scattered petals from the window but can’t touch them. The bottom layer is the base. The upper two layers is the cover. Of course, the cover is locked. From the base, you can move the cover from front to back and right to left freely. When you move the cover, each petal also moves. To unlock the cover, move the petals and make a typical “flower”. That is, you need to gather all the scattered petals togather. How do you do it? Ｃreated : 03/2009 Size : 102 x 102 x 76 mm Material : walnut, birch, maple, acrylic board, etc.
Confetto Box	RF-22	This work was originally made as a Christmas present for 2008, but after several years its now a mechanical piece. There are two compartments inside. The two lids are opposite each other. As you slide the four plates, the two lids can open. The first plate is quite easy to open, but you'll have to think about the second one! Created : 11/2008 Size : 86×86×86 mm Material : padock, shiuri cherry
Pencil Stand	RF-21	This is a work that you can use as a pencil stand. There is a small hidden space inside. It has 3 simple moves. But, it isn't difficult to understand it. Created : 05/2008 Size : 95 x 95 x 140 mm Material : rose wood, keyaki(zelkova), rengas, zebra wood, mizuki(dogwood)
Pencil Stand	RF-21-2	The mechanism is almost the same as the RF-21-1. But, additional secret space was made. To maintain smooth movement for the future, 3 boards were glued to make the pencil stand’s board. The black color and the red color are easy to shift the colors to the white woods. The craftsmen worked hard to prevent it. The “Zebra wood” is easily broken in processing. Therefore, an unusual processing method was needed. Designed : 01/2009 Size : 96 x 96 x 140 mm Material : rose wood, keyaki(zelkova), rengas, zebra wood, mizuki(dogwood)
Acorn Box	RF-20	This box opens with only one move. The cover rattles. But, the cover doesn't open even when you pull it up or turn any points of the box. It was unveiled at an exhibition that was held in Feb. 2008 by the craftsman and Mr. Ninomiya. At the exhibition, a customer who experienced Karakuri for the first time opened it very quickly, but a veteran of puzzles needed 30 minutes. This caused a lot of laughter! The acorn is made of wood. This work was designed for the marriage party of the craftsman's friend. RF-20-1 is a commercial version of it. Created : 02/2008 Size : 54 x 54 x 70 mm Material : oak, ginkgo, katsura, enjyu, pao rosa
Acorn Box	RF-20-2	This is a revised edition of "Acorn Box". In comparison with the initial version (RF-20-1), the idea is the same. But the way to open the cover is a little different. When people tried to open this work for the first time, the cover fell onto the floor, because, they didn't know the solution. In RF-20-2, the mechanism has changed, and that won't happen. (For the time being, I'll produce RF-20-2 as the standard version.) Created: 07/2008 Size: 54 x 54 x 65 mm Materials: oak, katsura, enju, etc.
SUSHI	RF-19	This is one of the works that were developed for the cause of the concept to "make works associated with Odawara and Hakone". In Odawara, there are fishing ports and we can have fresh marine products. "SUSHI" is a famous food of Japan. The idea of making "Karakuri SUSHI" has appeared repeatedly among Karakuri craftsmen, but, it has never been made. If you know the solution, it isn't difficult to open. Please find two spaces inside. The hints are "how to eat" and "how to hold" them. Created : 02/2008 Size : 120 x 180 x 90 mm Material : ginkgo, shiuri cherry, mizuki, bubinga, zelkova, old katsura
Sushi	RF-19-2	When RF-19-1 was displayed at the exhibition, the craftsman heard various comments from customers. “When we dip the rice into the soy sauce, the rice will fall apart!“, “I’ve never seen a square soy sauce plate!” Based on the opinions, RF-19-2 is a revision of RF-19-1. I studied so much about Japanese culture! Created : 07/2008 Size : 120 x 180 x 90 mm Material : ginkgo, shiuri cherry, mizuki, bubinga, inomi, old katsura
Secret Base	RF-18	It was created as a Christmas Present for 2007. The craftsman often watched TV robot animation. When a bad enemy destroys the town and the peace of the people, the shutter of a secret base that is hidden under the ground opens and a robot of the justice comes out to save the peace. It was an exciting scene. The shutter is the motif of this work. There are two spaces inside. Created : 11/2007 Size : 90 x 90 x 67 mm Material : shiuri cherry, oak, zebra wood, rengas, keyaki(zelkova), ancient katura
Secret Base	RF-18-2	This is a remake version of RF-18-1. The surface pattern was changed. The color of RF-18-1 was showy. The color of RF-18-2 is more subtle. Well, the design is not just a simple decoration. The inlay line is related to the device. You can see the read or orange lines. When you move the plates well, you can connect them. Then, you can open the second compartment. So, how do you connect the lines? Designed : 02/2009 Size : 90 x 90 x 67 mm Material : shiuri cherry, oak, walnut, old katsura, amur corktree, rengas, old keyaki(zelkova)
ONIGIRI (Rice Ball)	RF-17	The craftsman often had his mother cook ONIGIRI (a Rice Ball) when he was a child. He liked miso ONIGIRI and grilled ONIGIRI. Which kind of ONIGIRI did you like? The trick was made using the shape of the laver well. The two ONIGIRI are connected and move together. It has 5 moves. In addition, there are two extra spaces to be opened. Created : 04/2007 Size : 100 x 200 x 100 mm Material : walnut, berry, dogwood, ichii, old katsura
ONIGIRI (Rice Ball)	RF-17-2	This is a commercial version of RF-17-1. The mechanism is the same as RF-17-1. The traditional sheath under a real rice ball is "bamboo sheath" In both of the works RF-17-1 and RR-17-2, the "bamboo sheath" is made of the same wood. In the RF-17-1, it is very thin just like a real one. On the other hand, in the RF-17-2, the thickness of it is around two millimeters. It is stronger than the thin one. The size of the setting are a little different between RF-17-1 and RF-17-2. Created : 04/2008 Size : 140 x 230 x 110 mm Material : walnut, berry, dogwood, ichii, old katsura
Covered Chimney	RF-16	It was created as an Xmas Present for 2006. The theme of this work is the brick chimney that Santa Claus comes down. But, it is covered so Santa Claus can't come in. How do you open it? While you play with it, maybe you can find some hints to open the lid. In fact, the different color bricks is a hint. When you open it, maybe you can enjoy the transformation. Created : 12/2006 Size : 84 x 84 x 84 mm Material : katsura, walnut, berry, etc.
Ichigo Shortcake	RF-15	Although most of his works have been rather complex and difficult, this time he created a work that has a simple device. Since the exhibition theme is "Valentine", he tried to make his work pretty. When you move the device correctly you will be able to separate the cake from the plate and find a small space inside. I believe while he was making this he must have been studying the design eagerly since he ate 7 or 8 kinds of shortcakes. Therefore the title 15 (ichi-go, one and five, also meaning strawberry in Japanese) seemed natural. Now this ichigo shortcake is in front of you, how do you begin to eat it? Created : 01/2006 Size : 140 x 150 x 95 mm Material : Padauk, Dogwood, Zelkova, Maple, etc.
Box with a tree	RF-14	It was created as an Xmas Present of 2005. The appearance looks like a Secret Box, though there isn't any Mosaic pattern on the surface. On the top, there is a small decoration of a tree. You can find 2 plates you can move freely. Usually you move one plate at first. But, in this case that would be wrong. The important point is how to open the 2 plates. It takes only 4 ways to open the final plate. But, it may be difficult without knowing the solution. The small tree on top is also a hint. created : 10/2005 size : 98 x 68 x 53 mm material : Japanese walnut, oak, acrylic board, etc.
Box with a tree	RF-14-2	This is a remade version of a work that was designed for the 2005 Christmas present. It was made with different materials. It was made in one giant size. It has 4 moves. You need a special device to solve it. The decoration of the tree is a hint, too. Created : 09/2007 Size : 117 x 82 x 60 mm Material : Katsura, Teak, Rosewood, acrylic board
Memory Drawers	RF-13	This work memorizes 120 (The factorial of 5) kinds of turn to open the drawers. The big base is full of 30 device plates. The plates move vertically and horizontally, and change the arrangements when you open or close the drawers. The work memorizes the turn you closed the drawers just before automatically, and change the turn to open the drawers next. In theory, 6 kinds / 25 plates are needed to realize this system. But actually, instead of that, 3 kinds / 30 plates are used. It’s a full-scale work that matches his previous “Super-CUBI”. The designer was eager to make it since he began to make Karakuri. It will be a most favorite work for the designer. Created : 04/2005 Size : 209 x 181 x 104 mm Material : walnut, maple, silky oak, birch, rosewood, acryl
Cage Burr	RF-12	12 pieces parts moves on 12 pieces parts. The base is "Akadama" of Hakone Works. Each part has a pin or a simple groove, and control the movement each other. But, I think it isn't difficult for puzzlers to put together. Maybe I can't say it's an pure interlocking puzzle, because I used pins. I think I can expect to apply this mechanism for another works. created : 07/2004 size : 127 x 127 x 127 mm material : maple, keyaki, magnolia, rengas
Byway Secret 3 (katsura, koyosegi)	RF-11	This is the 3rd one of the Byway Secret series. For the present, maybe it's the last one of this series. I name it another name, "Wrong side secret." You can't see the decoration on it. But, it was designed like this on purpose. Can you imagine this meaning? There are 2 compartments inside. The first room is easy. But, it takes 21 moves to open the second room. I applied almost elements of traditional Himitsubako's main devices to my box. created : 07/2002 size: 150x100x80mm mm material: katura, etc. Yosegi: Koyosegi
Byway Secret 3 (walnut, yellow-wave)	RF-11-2	It's also a Byway Secret 3 that has different color, and same mechanism. As the material Walnut is heavier than previous Katsura, it looks solid. It took enough time from the announcement of this Byway Secret 3, I'll explain about the inside of this box, you can find Yosegi inside. The Japanese name "Ura-Himitsu-Bako". "ura" has another meaning and it's "inside out", in addition to "byway". Like this, the mechanism of the box is "iside out" style, and the surface pattern is also "insaide out" style. You can see "Koyosegi" inside Byway Secret 3 (katsura), and you can see "wave (blue-sea-wave)" inside Bway Secret 3(walnut). Though the color of the wave is yellow. ("blue" is just the name) The yellow color is shine in the quiet walnut color. created : 07/2002 size: 150x100x80mm mm material: walnut, etc. yosegi: wave (yellow color)
Pineapple Secret (twist, black)	RF-10	It’s also a Himitsu-bako that has 18 plates and 33 moves. Of course, Then the movement is also different. The normal pine (RF-9) has a basic shape. But, this pine has another twisted shape. One sub mechanism is placed twistedly. Then those 2 sub mechanisms will obstruct the main mechanism at different place. Then this arrangement makes the answer of this twist pine different between normal twist. not for sale created : 07/2002 size: 160x160x160mm material: katsura, wendge, keyaki, others
Pineapple Secret (twist, black)	RF-10-2	This is the commercial version of the RF-10 Pineapple Secret (twist, black). This is a Secret Box with 18 plate moves and has over 30 steps. The shape of the body is a twisted polyhedron. The movement is different from the RF-9-2. The mechanism was changed only a little from RF-10 just a small adjustment. The degree of difficulty in solving it will be almost the same as the RF-9-2. Created : 09/2010 Size : 145×145×250 mm Material : walnut, keyaki(zelcova), amur corktree
Pineapple Secret (normal, yellow)	RF-9-2	This is the commercial version of the RF-9 Pineapple Secret (normal, yellow). This is a Secret Box that 18 plates moves and has over 30 steps. It was redesigned in various ways to improve the precision. The body size is smaller then RF-9. This time, the leaf was produced, and it looks like a real pineapple. At the RF-9, the leaf wasn't produced because of the schedule. Created : 12/2006 Size : 145 x 145 x 250 mm Material : walnut, keyaki (zelkova), amur corktree
Pineapple Secret (normal, yellow)	RF-9	It’s a Himitsu-bako that has 18 plates and 33 moves. I call 8 plates they are placed like the equator of the earth, “main mechanism.” They move like “4 moves Himitsu-bako” as a whole. Well, there are 10 plates placed like a cross on right and left hemispheres. I call them “substitution mechanisms.” When you slide plates, the sub mechanisms will obstruct the main mechanism with a time lag. Then, you will have a hard time to open and close. not for sale created : 07/2002 size: 160x160x160mm material: katsura, wendge, keyaki, others
Byway Secret 2 (yellow)	RF-8-1	This is the 2nd version of the Byway Secret series. There are 2 rooms inside, and you'll be able to open the 1st room soon. But, it takes 10 moves to open the 2nd room, and you'll miss your way to open. The right side and the reverse side will intertwine and move each other. It was made with a new mechanism that is an application of traditional Himitsubako's bar device. The difference between yellow one and red one is only the color of inlay on surface. They have same mechanism. created : 06/2002 size : 120 x 84 x 64 mm material : walnut, katsura, etc.
Byway Secret 2 (red)	RF-8-2
Blue zebra	RF-7	It's a puzzle version of dream of zebra. All the plate move same as the dream of zebra. But for example, it will be locked when you take mistake. You can't open it easily. Not For Sale created : 08/2001 size : 120x120x120mm material : cherry tree, etc.
Byway Secret 1	RF-6	To say about traditional secret boxes, the outside plate moves. But, this is "Byway" type and It's new. created : 08/2001 size : 88x88x88mm material : walnut, etc.
Byway Secret 1	RF-6-2	The mechanism is same as the RF-6. The size of the appearance and the structure was changed. The box became stronger. created : 08/2005 size : 108 x 84 x 72 mm material : magnolia, maple, padock, old katsura
Sliding 4 Drawer Chest	RF-5	At first, you can't open the drawers at all. You can slide the drawers each other and unlock the key. Not For Sale created : 08/2001 size : 190x170x200mm material : oak, etc.
Super-CUBI (the trinary system box)	RF-4	This box is developed by one of CUBI (the binary system box made by Mr. Kamei) It has the trinary system in it. You can open it with 324 moves. But, you need 324 moves to close it again. It's the world record. I think, you need a little patience. It was named by Mr. Steve Barnett. created : 12/2000 size : 131x131x131 mm material : cherry tree, walnut, etc.
Super-CUBI (the trinary system box)	RF-4-2	This is a remake version of Super-CUBI. It also has the trinary motion. But, I changed the orders of plates to move. It has a new surface design and now you can't tell apart the 6 plates. It must be easier to lose your way. After an exhibition, I found a calling card inside. He appealed "I opened it !" Then this time, I put into a small card inside. What color is the word ? (Well, there isn't a prize !) created : 05/2002 size : 131 x 131 x 131 mm material : walnut, cherry tree, etc.
Super-CUBI (the trinary system box)	RF-4-3	This is a remade version of Super-CUBI. It has 324 moves. The motion is the same as the RF-4-2. The word, "congratulation" was written on a small paper and put inside the box. What color is it this time? created : 08/2007 size : 131 x 131 x 131 mm material : walnut, cherry tree, etc.
Super-CUBI (the trinary system box)	RF-4-4	It is a remake version of “Super-CUBI”. A regular customer cried, “I’m tired when I move 300 times!” The craftsman understood that. Therefore, this time, the new copies were adjusted a little loosely. Well, have you ever heard “Speed Cubing” of “Rubik’s CUBE”? It is a speed competition. Top players seem to solve it in about 10 second. It is a unbelievable speed. By the way, the craftsman sometimes tries “Speed Cubing” of “Super-CUBI”. Now, the looser adjustment is suitable. Until now, Feb. 2009, his best record is 43 seconds. But, the Contestant population is maybe only one. Everyone, please try! created : 01/2009 size : 131 x 131 x 131 mm material : cherry tree, walnut, etc.
Super-CUBI (the trinary system box)	RF-4-5	They are remake version of “Super-CUBI”. RF-4-4、RF-4-5 and RF-4-6 have same mechanism, and different surface material. At the RF-4-1, #1 and #2, #2 and #3, …#5 and #6 are neighbors each other. At RF-4-2 and RF-4-3, #1 and #2, #3 and #4, #5 and #6 are in the other side each other. F-4-4, RF-4-5 and RF-4-6 are a type same as RF-4-1. The RF-4-1’s type is called “Twin Box Type” from Kamei’s “M-1-1 Twin Box”. From the #1, the turn is Up, Front, Left, Down, Back, Right. On the other hand, RF-4-2’s type is called “Bypath Type” from Kamei’s “M-11-2 CUBI (Bypath)”. From the #1, the turn is Up, Down, Front, Back, Left, Right. created : 01/2009 size : 131 x 131 x 131 mm material : cherry tree, old keyaki zelkova), walnut, etc.
Super-CUBI (the trinary system box)	RF-4-6	They are remake version of “Super-CUBI”. RF-4-4、RF-4-5 and RF-4-6 have same mechanism, and different surface material. At the RF-4-1, #1 and #2, #2 and #3, …#5 and #6 are neighbors each other. At RF-4-2 and RF-4-3, #1 and #2, #3 and #4, #5 and #6 are in the other side each other. F-4-4, RF-4-5 and RF-4-6 are a type same as RF-4-1. The RF-4-1’s type is called “Twin Box Type” from Kamei’s “M-1-1 Twin Box”. From the #1, the turn is Up, Front, Left, Down, Back, Right. On the other hand, RF-4-2’s type is called “Bypath Type” from Kamei’s “M-11-2 CUBI (Bypath)”. From the #1, the turn is Up, Down, Front, Back, Left, Right. created : 01/2009 size : 131 x 131 x 131 mm material : cherry tree, karin, etc.
# Burr Puzzle	RF-3-1	This is an interlocking puzzle. Put the 42 parts together. created : 08/2000 size : 112x112x112 mm material : lengaus, oak
# Burr Puzzle(worm-eaten wood)	RF-3-2	This is an interlocking puzzle. Put the 42 parts together. (This is the same as "RF-3-1".) created : 08/2000 size : 112x112x112 mm material : lengaus(worm-eaten wood), oak
the Dream of Zebra	RF-2-1	This box has the same structure and Karakuri as the "12 Diamonds Box" has. I changed the surface design. I think that I could make more varied expression. (I may alter the material and the design.) created : 03/2000 size : 120x120x120 mm material : old katura, katura, cherry tree
the Dream of Zebra	RF-2-2	created : 05/2000 size : 120x120x120 mm material : walnut, katura, cherry tree
the Dream of Zebra	RF-2-3	created : 05/2000 size : 120x120x120 mm material : Tagayasan, katura, cherry tree
the Dream of Zebra	RF-2-4	created : 05/2000 size : 120x120x120 mm material : purple heart, katura, cherry tree
the Dream of Zebra	RF-2-5	created : 05/2000 size : 120x120x120 mm material : karinn, katura, cherry tree
12 Diamonds Box	RF-1	This box has 12 plates. Each of the plates has the same shape, and the same pattern. One of them is a lid, and you can open it. But, you can't at first. At first, you move the 11 plates in turn. At last, you can open the lid as the 12th operation. The motion is simple and not so difficult. I wanted to make an unusual shaped box. created : 03/2000 size : 95x95x125 mm material : walnut, cherry tree, oak

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