Boombox

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 442.7 Hz, 89 cents flat of B♭4, the nearest tine on the comb. The next fifteen are its overtones, and each one draws its own figure: sand gathers on the lines that stay still.

Tap it to play a beat.

A boombox is a portable stereo: a radio, a cassette tape player and two big speakers in one box with a handle, run on batteries so music could go anywhere. They were hugely popular in the 1970s and 1980s, carried to parks, streets and beaches.

Tap it and it plays two bars of a beat: the speakers pump and glow blue on each kick drum, and the tape reels turn. A cassette holds a thin plastic tape covered in tiny magnetic grains, and the music is stored in the pattern of their magnetism.

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