Diamond [v4]

1: Click / tap the power button to start the visualizer and click / tap anywhere to stop it.

2: Stare at the center of the visualizer without blinking for 20 seconds.

3: Start at something else.

This is a motion aftereffect.

Staring at the visualizer longer will lengthen the effect. You can manipulate the layout with your browser's zoom controls.

Use at your own risk, I have no idea how this may affect your vision.