Reading this result: Each of the 18 pendulums is set to a slightly different length, so its period drifts from the slowest (~2.00s, 30 swings per cycle) to the fastest (~0.61s, 98 swings per cycle). With a period spread of 4, the phases fan out into a traveling wave, dissolve into a chaos-looking scramble, and then all re-sync at the common 60-unit cycle before repeating. Wider spread reaches the disordered stage sooner; more pendulums makes the wave smoother.
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How it works
Each pendulum has a slightly different length and therefore period. Starting in phase, they gradually separate, producing snake-like traveling and standing patterns, before realigning after a full cycle — a beautiful demonstration of phase and frequency.
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