How to make an origami butterfly based on open sink-fold

(page 5)

7th picture of origami butterfly

07.

Turn the model over.

You can clearly see the effect given after applying "open sink-fold" here.

Let us parepare to turn the model over again to continue our work.

8th picture of origami butterfly

08.

Turn the model over.

Prepare to apply an "inside reverse-fold" .