Lava Lamp

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 784.0 Hz, right on G5. The next fifteen are its overtones, and each one draws its own figure: sand gathers on the lines that stay still.

Tap to heat it up. Pick colors, blobs and flow in the Splash tab.

A lava lamp is a glass bottle of liquid with blobs of colored wax inside, and a lamp in its base. When the wax is cool it is a little denser than the liquid and rests at the bottom. The lamp warms it, the wax spreads out and gets less dense, and a blob rises; at the top it cools and sinks again.

Tap it to heat it up: the blobs move much faster, the wax glows and shifts color, and the liquid brightens, then it all eases back. In the Splash tab, pick a color set or your own colors, how many blobs, their size and shape, how fast they flow, and a glow from within.

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.