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The YouTube video here will get you to think a bit. Basically, 15 separate pendulums that create various patterns:
I wonder though if you could say how many given patterns are created. Not sure how to describe that... what do you think?The period of one complete cycle of the dance is 60 seconds. The length of the longest pendulum has been adjusted so that it executes 51 oscillations in this 60 second period. The length of each successive shorter pendulum is carefully adjusted so that it executes one additional oscillation in this period. Thus, the 15th pendulum (shortest) undergoes 65 oscillations.