Norwegian engineer Kåre Halvorsen has developed the MorpHex robot sphere prototype that reminds us somewhat of a Metroid morph ball mixed with the design ethic of a Portal turret.

The robot has six retracting legs that allow for dancing and some rather fluid, sort of artistic movement that reminds you of the swelling and fading waves of a stock screensaver on your computer.  However, as the spherical shape would initially have you presuming, it doesn't roll yet.