Gomboc, a Unique Mathematical Innovation, self-righting Shape, Science Toy (one Size, Sandblasted Aluminium Gomboc)
UNIQUE MATHEMATICAL INNOVATION - 'Gömböc' (pronounced: 'goemboets') is the first and only known homogenous object with one stable and one unstable equilibrium point, thus two equilibria altogether on a horizontal surface. No matter what you do with it, it always gets back to its only stable point of equilibrium.