Two years ago tomorrow, Andy quoted from a letter to John Cooper from Kit Cooper the "official dimensions" of the pyramids and the formula that was used in making them regular. He also said, in that posting, "This is an amazing 5-page letter filled with hand-drawn diagrams and graphs and charts and equations. Perhaps later I'll scan in and post the whole thing." Did that scan ever happen? If it didn't happen: Andy, would you please do the scan? And thanks for the new beautiful obsession. I love your pyramids like I love Linux and Zometool. David L. Willson Network Engineer MCT, MCSE, Linux+ tel://720.333.LANS