Among other things, Dan P wrote:

>> istr eye structure similar to flies
>> hexagon based
>> can't remember the word! sad
> 
> You'll have a lot of luck if you use the normal:
> 
> normal
> {
>     hexagon (I don't have the reference -- it's something like that. Gotta
> look that up.)
>     scale <0.01, 0.01, 0.01> (or salt to taste)
> }
> 
> That might make a really cool eye pattern (wish I had POV-Ray at work).

Caution. The hexagon pattern is "made of" hexagonal prisms, it will give 
hexagons when the surface is perpendicular to these prisms, but something 
quite ugly when the surface is parallel. Can it be "wrapped around"?

-- 
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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