"The acoustic sand I’m interested in is rare sand that generates a deep hum when it is put in motion, whether by the wind or by your hand. This acoustic sand occurs only in a few remote locations around the world: a hill in the desert of Mongolia and an area in the middle of the Namib Desert, to name a few. Sliding these layers of sand over one other generates vibrations that emit a deep, low rumbling pitch. This principle can be compared to a bow striking a cello string. In volume, this concert of sand can be as loud as the sound of a helicopter flying over your head."
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