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parallel, then radial

inspired by the right model in this picture.

 

the primary pleats are parallel.

secondary are two sets of radial pleats. they are centered in the middle of the long sides and opposite to each other as in this model. the center line which connects the centers of the radial pleats is not used in the collapse.

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Uploaded on April 20, 2012
Taken on April 20, 2012