It has movement called expansion. The expansion type has good affinitywith a mechanical box, and there are some precedents. On the other hand,there is no box which uses contraction movement. In this work, I changedmy way of thinking and was able to use the contraction movement. Themechanism is simple.
This work was produced by Karakuri Creation Group’s craftsmen, from a selected idea of “6th Karakuri Puzzle Idea Contest”.

Original idea by Yasuhiro Hashimoto
Hand-crafted by Hideaki Kawashima (Karakuri Creation Group)