(CBS) - The "pendulum wave effect" is a well-documented phenomenon that has been demonstrated in numerous classrooms around the world... but have you ever watched it with a black light and music? No? Then this is a video you should check out. The effect kicks in at about 30 seconds into the video.
The video was created by YouTube user "brusspup" who writes about the experiment:
The effect works by using a formula that provides the specific length for each string. When all of the pendulums are started at once the patterns will start to form. The pattern resets after about 1 minute. I glued white poster board on the sides of the nuts and used a black light, causing the white to glow.