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Watch 32 discordant metronomes achieve synchrony in a matter of minutes »

If you place 32 metronomes on a static object and set them rocking out of phase with one another, they will remain that way indefinitely. Place them on a moveable surface, however, and something very interesting (and very mesmerizing) happens. Source Main page (current trends)
More about: discordant metronomes, metronomes, static object