Two swinging pendulums, one pen — the 19th-century harmonograph, alive in the browser. It traces endless looping figures that slowly morph as the rhythms drift apart. Move your cursor to bend the swing.
The pen's frequencies drift continuously, so the figure endlessly reshapes into new symmetries.
You watch the line being drawn stroke by stroke, fading behind it like ink on a slow plotter.
Your pointer nudges the pendulum frequencies — the whole pattern warps as you move.
A handful of sines on 2D canvas. No WebGL, no assets — mathematics as motion.