I saw this video on “Videos I found on reddit” where this guy had salt or something on a table, and he had this thing he rubbed on the table that made a sound and moved the salt into a star like shape, then he used a different object that made a deeper tone that moved the salt back, can anyone explain this? If needed i can provide a link and timestamp
In: Physics
The table vibrates with the sound waves. Where the waves have a high amplitude point the salt vibrates away and gathers where the wave doesn’t move the surface of the table as much.
It’s like [this](https://www.youtube.com/watch?v=-gr7KmTOrx0) but not on a simple wire but a whole surface so you get 2D patterns.
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