Sunglasses

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 1089.7 Hz, 70 cents sharp of C6, 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 them (the frame or a lens) to fold the arms, flip the glasses round and darken the lenses.

These are round glasses with light-changing lenses. Special molecules in the lenses change shape in the sun's ultraviolet light and start to absorb light, so the lenses turn dark outdoors and clear again a few minutes after you go inside.

The frame comes from a detailed 3D model of real vintage spectacles. Tap them and the arms fold in on their hinges one after the other, the glasses flip over to face you and the lenses darken from clear to deep gray, then everything unfolds and clears. Pick a flag in the top bar and the frame wears its colors.

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