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The valley- and mountain -folds

A piece of paper has two sides. It can thus be folded in either of two directions. Each of these folds has a name: the valley-fold and the mountain-fold.

The valley-fold






Folding a valley-fold
Fold the lower edge upward to get your valley-fold. When you swing the lower edge down again, you will see a thin line indicating where the paper has been creased.







The mountain-fold





Folding a mountain-fold
Swing the lower part of the paper underneath the upper part of the paper to get a mountain-fold. When you swing the lower edge back again, you will see a thin line indicating where the paper has been creased.






The reverse-fold combines the valley-fold and the mountain-folds. In a reverse-fold, two or more layers of paper are folded together symmetrically along a single crease.

The reverse-fold comes in two types:

Inside reverse-fold (the most used)
Outside reverse-fold.

Click here for the reverse-folds.