Telescope

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 1209.7 Hz, 51 cents sharp of D6, 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 to collapse it; tap again to pull it out.

A telescope uses lenses or mirrors to make faraway things look nearer and bigger. This is a sliding spyglass, the kind sailors carried: its tubes slide inside one another, so it folds up short and pulls out long, with a big lens at the far end that gathers light. Galileo Galilei used a small telescope in 1610 to see the moons of Jupiter.

The telescope starts pulled out, on a three-legged stand. Tap to collapse it, sliding the tubes together, and tap again to pull it out. With ✋ Hands-on on, pull the tubes out and push them back in by hand, one inside the other.

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.