Mountain Fold in Origami
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Mountain-fold is one of two important folding technique in origami. Equally important folding technique is Valley-fold. If you know these two techniques, then you can fold almost all of simple origami models.
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When you are studying an origami diagram, you will be encountered with line symbols such as dashed line or dot-dashed line. A simple dashed line represents a valley-fold while a dot-dashed line for a mountain-fold. Here I use the blue color for a mountain-fold and the red color for a valley-fold just for a convenience. |
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For an example, if a diagram shows a vertical dot-dashed line in the middle of the paper, it means you should mountain-fold along the line. |
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If you apply a mountain-fold to the dot-dashed line, the paper will be transformed to form a "mountain-shaped" figure.
The result is exactly opposite when you apply a valley-fold which produces a "valley-shaped" figure. |