Thanks to all of your replies to my question we've stablished that both Natale Fietta and Molly Kahn created the model, although Molly Kahn created it first, since it was published in The Origamian in winter of 1967. Molly Kahn gave it the name Hexahedron and Natale Modular Bipyramid. Finally, Richard L. Alexander and Michael LaFosse have both made variations of the model.
Thank you guys. I would like to contact Molly Kahn; can any of you help me contact her? Also, I wanted to mention I found through Google another variation of the model: Fortune Cookie Box also by Michael LaFosse. Published in the previously mentioned books: Classic Origami and Story-gami which is co-written with Richard L. Alexander. -- Gerardo gerardo(a)neorigami.com
