Concep of Gordon's curves?

 From:  Frenchy Pilou (PILOU) 22 Jul 2007  (1 of 3) 
785.1 
What are the general rules for draw the curves for obtain Gordon's surfaces?
These follow are some baroque in the result !
Surprise of the surface! :)

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Pilou
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EDITED: 22 Jul 2007 by PILOU