Draw real harmonograph art online with a simulated antique pendulum drawing machine. Harmono models four damped pendulums (two per axis) the way a real 19th-century harmonograph does, tracing a decaying curve onto virtual paper that spirals inward as the swing dies out. A tiny mismatch between each pendulum's frequency is what makes the pattern slowly precess into a dense rosette instead of a static loop. Tap Draw a new one for an instant fresh design, or dial in the base frequencies, wobble, and decay yourself to sweep from tight spirals to sprawling flower-like tangles. Choose sepia, indigo, emerald, crimson, or a rainbow ink. Nothing uploads anywhere - it all draws locally in your browser. Save the finished piece as an image or copy it to the clipboard to share.
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