Fireworks

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 246.3 Hz, 105 cents flat of C4, 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 launch a firework; tap quickly for a few at once.

Fireworks were invented in China more than a thousand years ago. A firework shell is shot high into the air, where it bursts and throws out little pellets called stars, which burn in bright colors. The colors come from metals mixed in: strontium burns red, barium green, copper blue and sodium yellow.

Tap it to launch: a rocket rises from one of the tubes in the crate and bursts in that tube's color. Each tap fires a different tube and a different shell: a round peony, a ring, a drooping willow or a star, so no two in a row look alike. Tap quickly and up to three fly at once, one from each tube.

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