The Space Warp Desktop from ThinkGeek "features either chromed ball bearings or glowing orbs perpetually rotating on a clear track." Video after the break. Click here for one more picture.
Flip a switch on the back to choose which type of balls you prefer, while the ones you don't want are automatically sorted and stored in the base. The glowing balls are powered by a built in UV light in the base which charges them up, causing them to glow as they roll down the track only to be charged up again at the end of the run
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[Source: Tech Blog]