Thank you very much, I've modified it slightly to:

camera#macro Z(Y)difference#macro X(T)box{-T-z/4-1T+z/4+1}#end{X(.2)X(x)X(y)
X(z)plane{-Y*y.0}rotate(y+z/3)*Y*9pigment{rgb<on.8.2>}no_shadow}#end{look_at
0location+x*1e3angle.3}Z(-5)light_source{x*9on}Z(5)light_source{99*(1-y)1}

It's just a shuffle and a slight macro change.

-- 
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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