This is a new - but similar - one, I'd like it to be just 3 lines, is it 
possible? :)

light_source#macro Z(Y)difference{X(.2)X(x)X(y)X(z)plane{-Y*y,0}rotate
Y*(3*y+z)pigment{rgb<1,.8.2>}no_shadow}#end{99*(1-y)1}light_source{9*x
1#macro X(T)box{-T-z/4-1T+z/4+1}#end}camera{orthographic look_at 0angle
30location x*10}Z(15)Z(-15)

-- 
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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