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Arigomi t1_iwzyt48 wrote

In simple terms, appendages are made from flaps. Multiple flaps can be created if you repeat the pattern of creases used to make a flap.

To illustrate this concept, think of accordion folding a sheet of paper to make a paper fan. Each rectangular ridge of the fan is a flap. It is not a very useful shape for a flap, because it is too short and too wide. Fortunately, there are various techniques in origami to make flaps in other shapes.

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