Oloid

An oloid is a geometric shape discovered by Paul Schatz in 1929, formed by connecting two circular disks at right angles through their edges. It's fascinating because of its unique rolling motion, which combines a wobble and a smooth roll that is both satisfying and mesmerizing to watch. The oloid rolls in such a way that every point on its surface touches the ground at some point during its motion, making it a space-filling shape. Its construction from two circles and its ability to roll smoothly make it a subject of interest in both mathematics and art. This combination of simplicity in design and complexity in movement highlights the elegance of geometric principles in motion.

Outer Dimensions: ~5cm tall

There is even an interesting song about oloids!