A relaxation tool for your eyes and ears.

A meditative instrument for the browser, made playable.

Pendulums of mathematically related lengths swing across a beam. Each strikes a tuned note as it crosses centre. Over a few minutes they drift in and out of phase — wave, fan, chaos, repeat.

Drag a ball to retune its note. Save your own presets. Use the timer to wind down before sleep, or to mark out a study session that gently brightens in its closing minutes to bring you back.