Viewing direction is really important in shaping our perception of what we are looking at.
Escher for Real brings Escher's drawings to
life as real world models.
Our brains are hardwired in lots of interesting ways. If you mess with the assumptions it makes,
you get lots of interesting effects. For example, see Cassidy Curtis'
Eye Stilts.
Eric Weisstein's World of Mathematics from Wolfram Research. A great
mathematical resource.
Computer Science & Engineering
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