Some men and women really like this. Especially women. This person uses it for something else, but also really likes it. While he or she covers the metal plate, you can see that the sound doesn't affect the sand; it doesn't create a pattern. But when the sound, the frequency turns higher, the sand slowly begins to form patterns. Now how does this work?
It's just a speaker under a metal plate. Just mess around with the frequency and.. violá, there's something happening. The waves that the speaker generates "hit" the sand, causing them to move.
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