Sound and matter interactions; Chladni & Jenny
Thanks to Michael in Arizona for alerting me to this very intuitive demonstration of how shapes resonate with different vibrational patterns and frequency interactions (quite reminiscent of Hans Jenny's Cymatics work):

Chladni Resonance Effect - sound makes form

You can feel with your ears when the sound interactions are more complex and more dissonant, and see it reflected in the patterns at the same moment.
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