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A "Mountain" fold is not actually a special fold of any sort. It simply indicates the direction in which the paper is folded, and is the opposite of a "Valley" fold. Because of this, the nature of the fold depends on how you're looking at the paper.

To see an example, take a piece of paper and fold it in half. Now set it down on a flat surface, with the two edges down and the new crease pointing upwards. You're now looking at a mountain fold.

Now flip it over, so that the paper is resting on the crease (and perhaps tipping over), and the two sides are pointing upwards. You're now looking at a valley fold.

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12y ago

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