Ah, Arduino. I have seen some truly innovative and useful things done with the Arduino, but mostly it's fun, beautifully useless stuff. This falls solidly in the second category, and I love it.

Using an Arduino, a dismantled PS2 controller, some casters, and a yoga ball, these brilliant hackers have made a lifelike Katamari controller, where the movements of the ball translate to the Katamari on-screen.

In other news, that song is now in my head and I need to play this game again.