Hakone Yosegi wooden mozaic Secret puzzle box No.6 gimmick Japan handcraft Japan

(Size)   : Body : 4.7 x 4.7 x 4.2 cm / 1.85 x 1.85 x 1.65 inch 
              Storage part : 2.78 x 2.78 x 1.6 cm / 1.09 x 1.09 x 0.62 inch 

(Material) :  Walnut

(Origin) : Made in Japan / Hakone yosegi zaiku

(Condition) : Brand new

(Note) :

Karakuri Small Box #6 was created based on "Top Box" (M-5-1).
People who know the "Top Box" will have already understood the answer.
If you don't know, perhaps it is difficult to open.
Can you imagine the answer from the title?
Maybe you need a slight skill to open it, because it as a small size work.
Might be you had better to use a desk for this box too. 
If anything, might be you better play on the carpet.(？)

With answer