Brain

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 323.5 Hz, 32 cents flat of E4. The next fifteen are its overtones, and each one draws its own figure: sand gathers on the lines that stay still.

Tap it to think. Try the Sparks slider in the Splash tab.

The brain is the body's control center. Its wrinkled outer layer, the cortex, is folded so that a lot of it fits inside the skull, and it is split into lobes that do different jobs: the back handles seeing, the sides hearing and memory, the top touch, and the front moving, planning and deciding. It works by sending tiny electrical signals between about 86 billion nerve cells.

Tap it to spark a thought: light races along the folds of the lobe you tapped, then through the others, and every lobe flashes at once. The Sparks slider sets how many sparks twinkle over it, and the Splash tab can color it by lobe or plain pink.

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