Among other things, hermans saw fit to write:

> As I have a page http://cage.ugent.be/~hs/tribar/ on my site concerning
> Penrose's impossible triangle using povray, I'm interested in the macro.

Look at my signature! (if you haven't already).

-- 
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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