The art of resonance

There is a physical phenomenon called resonance: when you make a body vibrate in a certain frequency, it assumes certain patterns, where parts of the body move and others don't. When you put sand on top of that body, it follows the pattern, accumulating in the parts that don't move.

This is what they did in the video below. It's very interesting! If you want to see the complete video with the original sound (it's loud!), check it here.

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