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| | Davis Associates, Inc. on Dragon curves |
 | | The classical Dragon curve, discovered by physicist John E. Heighway, is the curve that results when a sheet of paper is folded in half, then folded in half again, and again, etc. and is then unfolded in such a way that each crease created by the folding process is opened out into a 90-degree angle. |
 | | The term "classical" Dragon curve refers to the curve that results when the original folds (as opposed to the more numerous creases that are created) are all in the same direction. |
 | | Second, and perhaps most remarkable, four copies of the Dragon curve, each starting from the origin in one of the four orthogonal directions (e.g., east, south, west and north), never intersect each other and, in fact, are lattice-space filling (interlocking). |
| www.davis-inc.com /dragon (545 words) |
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