Explanation of the symbols Basic Folds  Inside Reverse Fold or Outside Reverse Fold
Squash fold, Rabbit Ear Fold and Petal Fold. There is a series of several bases that many models are created with There are so many different versions that could be called "swivel folds". Pentagon fold, start with a triangle, pentagon, hexagon, circle, or other convex sheet of paper. The stretched bird base is used in Lang's Bald Eagle, Greenberg's Eeyore, and some other high-intermediate and complex models. Unsink, or sometimes just unsink, makes a concave pocket convex without fully unfolding the paper, or the opposite of an open sink.

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