TITLE: Harmonograph — A Drawing Machine FILE: 097-harmonograph.html === PROMPT (exact prompt used) === Build "Harmonograph — A Drawing Machine", simulating the Victorian pendulum drawing device. Two or three damped pendulums (x, y and rotary) combine to trace delicate, decaying Lissajous-like curves: x(t) = A1·sin(f1·t + p1)·e^(−d1·t) + A2·sin(f2·t + p2)·e^(−d2·t), and similarly for y. Render a very fine pen line accumulating on cream paper (#f6f1e3) in sepia ink (#3e2c1c) or selectable inks (indigo, oxblood, or gold on black paper). The machine is illustrated beside the drawing (a wooden table with pendulums swinging in sync, SVG). Controls styled as brass knobs and engraved dials: frequencies (with harmonic-ratio presets such as 2:3, 3:4 and near-unison detuning), phases, damping, pen width and speed. "Release pendulums" starts a fresh drawing that animates stroke by stroke; "Randomize" picks tasteful parameters; "Save drawing" downloads a PNG. Show the current ratio as a musical interval name (fifth, fourth). Typography: Victorian scientific-instrument labels in serif small caps. SHARED REQUIREMENTS (apply to every page in this 100-page collection): 1. One standalone HTML5 file. All CSS inline in