Donut

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 464.3 Hz, 93 cents sharp of A4, 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 break it apart and put it back together.

A frosted donut with sprinkles, built by the computer from a simple ring shape. To a mathematician, a ring like this is a torus. In topology, the math of shapes that can stretch but not tear, a donut and a coffee mug count as the same shape, because each has exactly one hole.

Tap it and it snaps into chunks that fly apart and tumble, showing the dough inside, while the sprinkles spray off. Then it all flies back together. The Make tab builds shapes like this from a shape, a palette and a seed.

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