Aurora World

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 285.8 Hz, 47 cents flat of D4. The next fifteen are its overtones, and each one draws its own figure: sand gathers on the lines that stay still.

Tap it for a burst of bright auroras.

An aurora is the glowing light that ripples across the sky near the poles, called the northern and southern lights on Earth. It happens when particles from the Sun are steered by the planet's magnetic field toward the poles and hit the gases high in the air, making them glow, mostly green, with pink and violet at the top.

This is the night side of an Earth-like world, its pole tipped toward you, with town lights below. Its curtains of light move all the time. Tap it to set off a storm of light: the ring flares, and a wider curtain bursts out toward the equator, then calms.

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.