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Fisicamente, o som é vibração mecânica propagando-se por um meio . Quando a matéria vibra de certas formas, ela pode literalmente se organizar em padrões. Um exemplo clássico são os experimentos de Ernst Chladni, no século XVIII. Ele espalhava areia sobre placas metálicas e as fazia vibrar com um arco de violino. A areia se movia e formava desenhos geométricos bem definidos — hoje chamados de figuras de Chladni. A vibração “organiza” a matéria em padrões visíveis. Mais tarde
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