Dancing MIT

Firts of all, I don't really want this one. I'm not into dancing but it certainly is a cool project which uses current and readily available technology. It costs $2500 but it's one of its kind, so it's not that expensive.

Enough detail: Some students at MIT have designed and built the USB Disco Dance Floor! It's got computer controllable lights (1536 of them) and colors and may be controoled by any computer with a USB port.
Dance floor in checkers configuration

As I said, it's not my thing but it shows what else can be done with simple materials and a little imagination.
Dance floor in spiral form