A simple machine, looked at from a certain angle, is mesmerizing. It can seem magical -- it can seem unearthly. Look at these swinging balls, watch the patterns. This is simple and complex and amazing math. It was made by a group at Harvard which is paid to make scientific concepts visible. (Yeah, that's their job. Check Harvard's site for a more detailed explanation.) http://youtu.be/yVkdfJ9PkRQ