* Self-similar objects.
* Simple fractals: iterate a modifying procedure ad infinitum.
* More complicated fractals: Julia set - associated to certain rotations of points (different angles for different points) followed by a similarity.
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(the first two pictures below are scooped from the web)
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* Rules of (classical) perspective: parallel lines meet at vanishing points on the horizon,lines parallel to the picture stay parallel in the picture,...
* Drawing geometric objects in (classical) perspective
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Da Vinci (1450) |
De Mey (1983) |
* Four non-degenerate types of conical sections: circles, ellipses, parabolas and hyperbolas.
* Techniques for drawing conical sections using strings.
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