Microglia

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 1788.8 Hz, 528 cents sharp of E6, 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 reach out its arms and sweep them to and fro.

Microglia are the brain's cleaners and guards. They are small cells with thin, branching arms, spread all through the brain, and they keep moving their arms to check the space around them, clearing away waste and worn-out parts.

This one's six arms feel about gently all the time. Tap it and every arm stretches out, sweeps to and fro twice, and draws back in. Real microglia can sweep over their whole patch of brain in a few hours, and they help keep the connections between neurons tidy.

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.