Youtube user TheOrigamiVoyueur has itself received in this time-lapse, as he folds a koi from a dollar bill. Simply an amazing transformation of a piece of paper towards a three-dimensional fish. Impressive!

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Folding Won Park's Dollar Koi

If you want to imitate the, available here the first of the eight parts of the manual.

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Won Park Koi Instructional Pt. 1.wmv