Open-closed sink-fold in origami (page 2)

 

01. We can start with a "balloon base" or a "square base" .   Here the "open-closed sink-fold" is represented with a double line shown on the left.

02. Here I applied a valley-fold to the "open sink-fold" line to both balloon and square bases.   Prepare to open the paper.

 

 

 

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