Playaflies

I’ve only been to Burningman once and I couldn’t help but look at things as electronics projects and kits – one of projects “playaflies” consisted of LEDs inside ping pong balls and then attached to wires/PVC pipe, at night when attached to a bicycle they take on the movement of the rider as they move about, it’s a neat effect – here’s more about them as well as how to make your own… Link.