Gomboc

thingiverse

The Gomboc is a remarkable, one-of-a-kind toy that showcases its incredible righting ability by always landing on its bottom no matter how it's thrown or tilted. Its clever design enables it to maintain balance effortlessly and bounce back into action every time. When tossed upside down, this unique plaything makes an exciting recovery with precision, consistently falling onto a flat surface. What's even more astonishing is that it can keep rotating freely, returning upright and still as soon as it comes into contact with the ground, due to its perfectly weighted shape.