How to make an origami butterfly based on open sink-fold (page 3)

 

03. Apply the horizontal valley-fold of the step #2.   It is actually easy to apply this fold since the top of the triangle should be located at the center of the height.   Prepare to unfold.

04. Unfold the previous valley-fold of the step #3.   Prepare to apply a "open sink-fold" using the crease line that you just have made.

 

 

 

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