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Decorative Knotting Using Trigonometric Parametrizations.
The Spirograph and kinematic models: Making math touchable (and
Spirograph - Wolfram Demonstrations Project
Spirograph Wolfram Function Repository
Spirograph Shapes: WPF Bezier Shapes from Math Formulae - CodeProject
What are the names of these polar curves: [math]r=rac{1}{1+.5
The Spirograph and kinematic models: Making math touchable (and
Creative Animations and Clocks with Trigonometry
Spirograph - Wolfram Demonstrations Project
Spirograph - Wolfram Demonstrations Project
Spirolateral -- from Wolfram MathWorld
Spirograph -- from Wolfram MathWorld