Bill Hails wrote:
> Reminds me of an article, either in SciAm's old Computer Recreations
> column or in Martin Gardeners excellent Armchair Universe book, about
> "parqu[e]t deformations" Escher being the archaetypal example.

I think it was in "Metamagical Themas" (Hofstadter's anagram of 
"Mathematical Games", after he took over the column from Gardner).

-- 
Anton Sherwood, http://www.ogre.nu/

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