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Seismograph

The arrow keys move the virtual pointer. The number keys one to nine place it on a grid. Enter activates a point. Hold down the space bar to hold on, and release it to let go.

Canvas2D · in progress · June 2026

Seismograph

A trace grows from left to right. Move your pointer or finger across the image and the line becomes more restless. Pause for a while and see the smaller shifts emerge. Sometimes there is a faint double beat, sometimes a larger deflection. The image also has a movement of its own. With reduced motion, a finished, still trace is shown.

Status: In progress · Last touched: 2026-06-11

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