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Rainstick

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A rainstick is a long, hollow tube of bamboo or dried cactus that is partially flooded with small pebbles, rice, dried beans, or other hard granular matter. The inside surface of the tube has small pins or thorns arranged helically. When the stick is rotated and held upright, the pebbles fall to the other end of the tube, bouncing off the internal protrusions to create a sound reminiscent of falling rain.