SPC-16Special
Spirograph
Hypnotic curves like in childhood
SPC-16Result
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Spirograph
A virtual spirograph: a wheel of radius r rolls inside a ring R while a pen at distance d draws the pattern. Tweak the numbers or press Random — beautiful combinations are endless. Download the result as a PNG.
Frequently asked questions
What curve is this?
A hypotrochoid — the trace of a point on a wheel rolling inside a circle.
Why does the pattern close?
When the ratio R:r reduces to whole numbers, the curve returns to its start.