The motif is an ATM money machine (Automated tellermachine). When you use an ATM to make a cash withdrawl, the drawer opens,you take out the money and a service fee is charged. When the drawer isclosed, it will lock, and the fee will be removed from your account. Atleast one coin is always left inside. This contradiction makes the puzzlefun.
This work was produced by Karakuri Creation Group’s craftsmen, from a selected idea of “7th Karakuri Puzzle Idea Contest”.

Original idea by Kyoko Sueda
Hand-crafted by Hiroshi Iwahara (Karakuri Creation Group)