Wasn't it Bill Pragnell who wrote:
>Christian Froeschlin <chr### [at] chrfrde> wrote:
>> A somewhat crappy "reproduction" of a linoleum cut by Escher,
>> using only two ambient spheres, a reflective plane with normals
>> and a POV-Tree mesh.
>
>This is very interesting because it shows just how good Escher's sense of
>geometric realism was. If you look at the distorted tree shapes reflected
>from the rippled areas and compare to Escher's drawings, the match is
>incredible. Sometimes  I think the man was a walking raytracer - the only
>raytracer ever to output directly to woodcut & lithograph!

Escher erroneously drew the moon's reflection as distinctly oval.

http://www.maths.qmul.ac.uk/~ade/sldimages/escher.ripple.gif

-- 
Mike Williams
Gentleman of Leisure

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