You can ‘see’ sounds. THey come in waves. When I drive my car I have music on all the time. Depending what’s on, the windows vibrate and sometimes the wing mirror! Especially on full bass! I play guitar, and if I put a drink on top of the speaker I can see ripples on the surface of the drink. You can also see waves in the air if you have a speaker in a dark room and pass a laser beam through the air.
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