Two ball chains (the kind you find on light switches) are shaken at 20Hz on a slot-shaped horizontal plate. After a while, they spontaneously separate from each other and wind themselves into two tight spirals.
Shaken chains
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Two ball chains (the kind you find on light switches) are shaken at 20Hz on a slot-shaped horizontal plate. After a while, they spontaneously separate from each other and wind themselves into two tight spirals.