Bells
BELLS consists of two metal plates which vibrate when they are stroked along their edges with a rosined bow. When each plate vibrates at a specific frequency, sand on the plate forms distinctive patterns. The sand bounces and collects along those lines where there is no vibration (known as the nodal lines). The patterns are determined by the shape of the plate, the spot on the edge where the bow is applied, and the manner in which the bow is applied.
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