See what happens when high frequency sounds are exerted on grains of salt:
nl.youtube.com/watch

""In the late 18th century, German physicist Ernst Chladni demonstrated the organizing power of sound and vibration in a visually striking manner. He showed that when sand is scattered on metal plates, and a violin bow is drawn across them, the resulting vibrations cause the particles to move to the places where the plate is almost motionless, producing a variety of beautiful, regular, intricate patterns."

Makes you wonder if the same thing is going on in our brains