Among other things, Xilo Musimene wrote:

>> Actually, when I was a child I was taught basic colours were red, blue
>> and yellow. Secondary colours would be green (blue + yellow), purple (red
>> + blue) and orange (yellow + red), cyan looks like a light blue.
>> 
>> I know this doesn't comply with colour theory, but it works when using
>> real paints (and when you're 6) ;)
> 
> Well those colors work in the Pigment theory, but in the Optics theory
> it's quite different, though the Pigment and Optic theory are linked as
> Pigment reflects Optics in a special manner...

It's an approximation to subtractive colour theory, valid for everyday 
crayons and for children (how many chindren do know what "magenta" and 
"cyan" are?).

-- 
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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