This looks like a scaled up version of this experiment that has been on youtube for about 5 years: https://www.youtube.com/watch?v=W1TMZASCR-I https://www.youtu

This looks like a scaled up version of this experiment that has been on youtube for about 5 years: https://www.youtube.com/watch?v=W1TMZASCR-I https://www.youtube.com/watch?v=W1TMZASCR-I (only 5 metronomes in that one, but I remember being fascinated when I first saw the effect)