Pendulum Waves

Capping off Mesmerizing Video Week (month?) here at GB, I give you: Pendulum Waves, a beautiful display of simple harmonic motion. Of course, it comes to us from a bunch of Harvard People, so I'd argue that the term "simple" here is relative. I don't want to ruin the exciting conclusion of the video for you, but here's some helpful background:
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. When all 15 pendulums are started together, they quickly fall out of sync—their relative phases continuously change because of their different periods of oscillation. However, after 60 seconds they will all have executed an integral number of oscillations and be back in sync again at that instant, ready to repeat the dance.
F. Scott Fitzgerald famously said that an exclamation mark is like laughing at your own joke. I wonder how this translates to the realm of science in the example below (taken from the info page):
Here at Harvard, Prof Eric Heller has suggested that the demonstration could be used to simulate quantum revival. So here you have quantum revival versus classical periodicity!
Har-har! That old "quantum rivival versus classical periodicity" trope! I might expect a Brown man to go for this kind of easy laugh, but it's sad to see Harvard stooping to this. Then again, a lot of people these days prefer the kind of humor they don't really have to think about.