all balls are linked with springs. they're not spawned at stable positions, so they wobble by themselves from the start. they would stabilize in a minute, so a random ball is slightly punched every 2 seconds to keep the wobbling. if the punch is too strong the springs break and the ball pops off (try changing the bump_mag var)
there seems to be a bug on the dates, the op should be from 2016-12-??, edited 2017-12-17...
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