In the Maker Shed: Karakuri Somersault Doll kit
Old technology can be simply amazing. Centuries before Arduinos, servos, and electric motors, Japanese artisans came up with the mechanisms for the Karakuri Somersault Doll. The technology for this doll was reconstructed from original figurines by the kit builders at Gakken, so you can recreate one yourself! The kit includes everything you need to build the doll including the screwdriver.