My friend, who knows I am into bikes, pointed me to some cool pov wheel sites that he had found.
[more info here]
Description from above page:
He originally stumbled on the material in a friend of a friend's blog post which has a lot more information as well as instructions.Each stick is 9" long with 32 LEDs, a microcontroller and hall-effect sensor. As the wheel turn, each stick detects a magnet attached to the chainstay which allows it to calculate current speed and 'sweep out' an image. While biking, the image appears to be static, floating inside the wheel, 3 or more sticks are needed to create a persistant image at any reasonable speed.
Anyone seen this before? Forget spoke cards, this seems to be the ultimate decoration .