Many-part systems can behave coherently through normal modes

Evidence

We have seen how a complex object consisting of many parts (beads, in this case) can behave simply and coherently, by vibrating in unified ways we call normal modes. Each normal mode is an independent harmonic oscillator—every bead or part of the string oscillating sinusoidally in time. Even a million beads act as a whole, with thousands of beads making a choreographed sinusoidal motion in each mode. The simplest mode is the lowest frequency one consisting of half a sine wave moving up and down with all beads acting in concert. In this way, a kind of simplicity has been reborn from the potential complexity of having so many beads. — Eric J. Heller, Why You Hear What You Hear- An…, 836

Categorization

• DEEPTHINKING: The idea that emergent simplicity is ‘reborn’ from vast complexity is the deep idea behind why collective oscillation underlies all harmonic sound.