RAUL GONZALEZ PEREZ / SCIENCE PHOTO LIBRARY RAUL GONZALEZ PEREZ / SCIENCE PHOTO LIBRARY
The harmonograph is a device that mixes two pendular motions into a pattern. Different patterns depend on the variations of the frequency of the pendulums relative to one another. The harmonograph used for this photograph used the light of a laser beam at the end of one pendulum and a mirror on the other, projecting the resulting pattern onto a screen.
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