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Several Spirograph designs drawn with a Spirograph set. Example of a Spirograph is a geometric drawing toy that produces mathematical curves of the variety. — “Spirograph - Wikipedia, the free encyclopedia”, en.wikipedia.org
Not to be confused with spirographs, which are generally enclosed by a circular boundary, This family of curves was investigated by Nathaniel Bowditch in 1815, and later in more. — “Lissajous curve - Wikipedia, the free encyclopedia”, en.wikipedia.org
 spirograph problems and improvements. Suggested Improvements by Experts for New or Discussion of the mathematics of spirograph curves, including parametric formulas for the. — “Talk:Spirograph - Wikipedia, the free encyclopedia”, en.wikipedia.org