Pufferfish

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 319.4 Hz, 55 cents flat of E4, 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 poke it. Hands-on: hold it and it puffs up; let go and it slowly deflates.

A pufferfish is a slow swimmer with a clever defense: when it is frightened, it gulps water and swells up into a ball several times its normal size, and in many kinds, spines stand out all over it. That makes it very hard for a hungry fish to swallow. Many pufferfish are also poisonous to eat.

This one rests slim. Tap it to poke it: it puffs up into a big, spiky ball, holds it, then lets the water out with a sputter and shrinks back. Try the Puff slider in the Splash tab too. With ✋ Hands-on on, press on it or pick it up and it puffs up into a spiky ball and stays puffed while you hold it; let go and it waits, then slowly lets the water out.

Made in Splashery. Its code is MIT.

This link opens it in the Playground. To put it on your own page, add the element and one script tag. Every option.