Two videos I bookmarked at different times, both because I’m sort of fascinated with resonance. Strikes me that they fit pretty well together.
Metronomes on a board:
People on a bridge:
Such interesting parallels. The way each metronome / person reacts to the result of the collective force generated by the individual movements of each of the others. The mix of the purely physics-based and the physics / behavioral interaction. The way, despite all starting fairly randomly, they all find their way to synchronization without trying to, just based on their interactions with their surroundings. The way, in effect, each individual in the group exerts a tiny force on the group, and the group exerts its collective force on the individual until all individuals in the group are the same. So many ways one could extend this metaphor / phenomena out to apply to other things.