have a look at these beautiful patterns being generated by sound
These figures are named Chladni-figures after the musician and physicist (yes at that time you could be very good in both) Ernst Florens Friedrich Chladni ( 1756 – 1827).
His most important work, for which he is sometimes labeled the father of acoustics, included research on vibrating plates and the calculation of the speed of sound for different gases.
and here’s a video by Steve Mould which explains the patterns
Food 4 Learning 
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