Gadgets that light up to musical rhythms are everywhere, but they're generally stationary. That's where the "Robotic Laser Ball" has them beat. This disco bot actually hits the dance floor on its own and "gyrates violently and flashes lights in time to your music," according to Red Ferret, for 50 seconds at a time. But keep an eye on it--the ball measures only about 4 inches in diameter, so it could get stepped on.
(Credit: Red Ferret)
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