For more info on the man and the field he helped pioneer:
Ernst Chladni on Wikipedia
Cymatics on Wikipedia
I rigged a speaker to an amplifier and a frequency generator. The speaker was modified such that the cone directly drives a square metal plate. Yellow art sand was added and when certain frequencies were dialed into the frequency generator, the sand would quickly coalesce to form patterns.
More details on setup will be posted here. I'm still working on it at the moment.
Meanwhile, enjoy the pictures!
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