Amoeba

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 390.5 Hz, 7 cents flat of G4. The next fifteen are its overtones, and each one draws its own figure: sand gathers on the lines that stay still.

Drag it to pull out a pseudopod; let go and it oozes back. Tap it to make it crawl.

An amoeba is a living thing made of one soft cell with no fixed shape. It lives in ponds and damp soil and moves by pushing out a bulge called a pseudopod, which means "false foot," and flowing into it. It eats by wrapping its body around bits of food.

Drag any part of it and it stretches toward your finger like a new pseudopod; let go and it oozes back. Tap it and it crawls: a pseudopod pushes out to one side, the grains inside stream into it and the cell oozes over; then it pushes out the other way and oozes back. Even at rest, its pods stretch a little.

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.