A pair of traditional Japanese geta sandals moves forward on its own with a little hopping motion. Turn it over and the mechanism is made from LEGO parts and a motor. It can also move backward.

The device was exhibited by Sugoi Lab at Maker Faire Tokyo 2026 and featured in a report on the event.

See the section 'コアメモリにダーツ、LEGO —— 古い技術と遊び心' in the linked article.