Web Reference: Jul 15, 2025 · A spirograph is a very interesting geometrical figure which is often symmetrical to both the axes. It produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids. Think about how you would draw the shape if you were the turtle, crawling on a large floor, dragging a paintbrush from your butt. At each small fragment of time, the turtle will perform one small iteration of a differential equation which governs the whole behavior. Feb 16, 2018 · A Spirograph is a geometric drawing toy that produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids. It was developed by British engineer Denys Fisher and first sold in 1965.
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