Escherizer; Sphere Eversion; Perspective

Some links from the Geometry Junkyard...

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Escherization
Researchers create an automated system that will take an arbitrary image and "Escherize" it so it tiles the plane.

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The Optiverse
Six-minute video (with a two-minute "hilights" reel) showing a new way to turn a sphere inside out, complete with dystopian ambience-music and breathless narration.

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Six Point Perspective

The sixth (South) point is missing from five point perspective drawings. Within five point we get half, or a hemisphere, of the visual world around us. To get the rest of the picture, the the whole picture that is, you must add that last vanishing point. You would have to turn around and look at the room BEHIND you to see the rest of the room and to find that last point.