> Once you have your 3d 'tile', you can stick a bunch of
> them together, and then use the operation r -> r/(r.r), where r is a vector
> representing any point, to get the effect in the image posted.

OK. Understood all of it but this part. Could you explain it some more 
please? To me it looks like your applying some kind of 
matrix/transformations to all points of the object, to get that uneven 
scaling, is that true?

And BTW, your image rocks!
Florian

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