Among other things, Tor Olav Kristensen saw fit to write:

> As I mentioned earlier, I wanted to model something like
> Escher's "Moebius Strip II" (woodcut from 1963) for my
> POVCOMP entry. But I didn't finish my macros early enough,
> so I had to abandon my attempt.
> 
> Yesterday I sat down and finished the most important
> macros and today I debugged them and rendered a scene that

> knot.

You do know similar things were also drawn by Escher (1965), don't you?
http://cybermuse.gallery.ca/cybermuse/youth/escher/enlargements/NGC_29143.jpg

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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