Spirograph - Wikipedia

File:Spirograph 2019-01-20 to 21st BDD Front Back CC0 Rev Daniel

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Design and the Magic of Spirograph

A hand-drawn spirograph curve from en.wikipedia.org/wiki

Spirograph Project - Help with Snap! - Snap! Forums

Spirographs and Parametric plots in Stata, by Asjad Naqvi

Spirographs and Parametric plots in Stata, by Asjad Naqvi

Philosophy of Science Portal: Epitrochoids and hypotrochoids

affine geometry - Is AffineTransform a reasonable way to draw