DIY, uh, Three-Pendulum Rotary Harmonograph

If you're like me, you looked at this picture and the name "Three-Pendulum Rotary Harmonograph" and felt confused and a little bit threatened. But fear not! Turns out it's one of those fun spirograph-like things you see at science museums. » 2/01/10 8:40pm 2/01/10 8:40pm