Some dude from Lancaster University's Physics Dep. - Nonlinear dynamics and medical physics group demonstrates how you can synchronize out-of-sync metronomes.
Metronomes (or "pendula") when on table, oscillate with random phases, since that is how they started and they are "uncoupled" (no energy/information flows from one to other so they do not "know" each other.) When they are all together on the cans, notice that the cans themselves oscillate little, providing coupling/information crossover. which forces "synchronization" in periodic systemsvia
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