The Secret of the Piano exhibits a basic resonance phenomenon where the vibrations of a collection of strings are kept in phase by all having a phase shift of half a period vs a soundboard in a "breathing" interaction between strings and soundboard with the strings moving "in" when the soundboard goes "out" and vice versa. The collection of strings and the soundboard thus take "opposite positions".
This phenomenon may also be seen in the interaction between human beings in a society, where a collection of people "march in step" e.g by sharing certain political views, and one may ask how this coordination comes about:
- Is it the idea of a leader that is adopted and followed?
- Is it a common "enemy" as the opposite of a leader, which unites people?