Harmonograph — Vibe Code Arcade Motion Lab

Three-pendulum · Lateral

CURRENT TUNING 3:2 · PERFECT FIFTH Drag to orbit · Pinch to zoom · Tap Tune to shape the trace

00:00 / 00:42

Motion & trace

Two axes draw; the third moves the paper.

READY

Paper trace · 220 × 160 mm

X / Y displacement

Frequency tuningRatios from reference

Pen X : Pen Y

Paper pendulum

Starting phaseOpen · 90°

Amplitude · each oscillator35 mm

Paper motion · third pendulum14 mm

Damping ratio · ζ0.010

Frequency X0.930 Hz

Frequency Y0.620 Hz

Frequency paper0.827 Hz

Rod X0.287 m

Rod Y0.642 m

Rod paper0.361 m

Planar pendulum: θ″ + 2ζ√(g/L)θ′ + (g/L)sinθ = 0. Trace = pen X/Y − paper X/Y.