Seashell Spiral

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 316.0 Hz, 73 cents flat of E4, 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 hear the sea in the shell.

Many seashells grow in a spiral. As the animal inside grows, it adds new shell at the opening, each turn wider than the one before but the same shape, so the shell gets bigger without changing its form. Mathematicians call this a logarithmic spiral.

People say you can hear the sea in a shell. Tap it and three soft swells of sea-blue light run down the spiral to the opening, and with each one a ripple rolls out of the mouth, widening and fading like a wave. The sound in a real shell is the noise around you, echoing inside it.

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.