This is a completely engrossing video of pendulums moving in and out of sync with one another. I’d love to see someone smarter than myself juxtapose the mathematics of this motion with the video.
A taste! “The period of one complete cycle of the dance is 60 seconds. The length of the longest pendulum has been adjusted so that it executes 51 oscillations in this 60 second period. The length of each successive shorter pendulum is carefully adjusted so that it executes one additional oscillation in this period. Thus, the 15th pendulum (shortest) undergoes 65 oscillations.” [via kottke]