bamboo whistle

[Easy] Paper Spring Car [Paper work]

[How?] 4 kinds of connected rings [Mysterious]

[Raspberrypi] A Crawling Robot, Fingalone [Robot]

Learning to swing up the pendulum with an ordinary motor [RaspberryPi]

Make a walnut shape - Simplified form -

True walnut shape

Digital Safe [3D-printer version]

[MAKING] Hand Robot hitting ping-pong ball

Hand Robot hitting ping-pong ball [RaspberryPi]

Miss Hand and Ping-pong bal

Inside of the Ghost in [Coin Box Protected By Ghost]

Coin Box Protected By Ghost

Transparent Cards 【Image processing】

[Easy to Make] Amazing Paper Jumper

Paper digital safe

Machine reading pips (Computer)

Easy to Make, but Not Straightforward to Get Inside Coins.

Paper Safe Unlocked by Key

Unlock not by Key but by Physical Force

Chicken Coin Box -more dangerous-

Cardboard pendulum clock: escapement mechanism

Box with a Wonderful Door which can be opened from both sides

Cardboard Dial Combination Safe

Coin Box, but DON'T put any coins in it.