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This is called the Chladni plate experiment.  Instructions:  Connect a tone generator to a wave driver (speaker) and attach a metal plate to the speaker.  First add sand to the plate then begin playing a tone.  Certain frequencies vibrate the metal plate in such a way that it creates areas where there is no vibration.  The sand "falls" into those areas, creating beautiful geometric patterns.  As the frequency increases in pitch the patterns become more complex.  Equipment by Pasco.   Music: "Dark Wave" by Brusspup.

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