The Origami Forum

I have an idea for a model I can modify, but I need to make 2 flaps from this one flap. It's about the size of a crane head but thinner. Reverse fold is all I can think of. The longer the new flaps the better. Thanks.

This requires a technique called point splitting, which you can read about in Origami Design Secrets.

There is some data about it here too (on Dr Stephen O'Hanlon's website).