Pendulum Wave

I became fascinated with the math behind the pendulum wave and wanted to create one that would oscillate for at least a minute. My pendulum wave uses 11 pendulums ranging from 140mm to 300mm in length with a 24 second oscillation period. I used a piece of 1.75mm filament to hang the pendulums for minimum friction and maximum oscillation time. Here's a high quality video (the GIF is kind of jerky). The lengths of the pendulums are set such that in a given time t, the first pendulum completes