Amongs other things, clipka saw fit to write:

> For a truly *realistic* shape, just use a plain sphere and bump mapping -
> you'll not notice the difference anyway. We're talking about roughly
> 1.4/1000th of the radius.

Erm... yes, sorry, you are perfectly right and I knew that. I really didn't
mean realistic to that extent, in other words, I want to (greatly)
exaggerate the relief :)

-- 
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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