I posted the pic in p.b.i.:

Forgive my grammar, I'm not quite sure how else to word it...
Shouldn't there not be shadows on the plane?  And shouldn't the background
be flat grey (no light attenuation)?

#include "colors.inc"   // Standard Color definitions
#include "golds.inc"

light_source {
  <0,2,-1>*8
  color White
}

sphere {
 0, 20
 texture {
  pigment { rgb 0.5 }
  finish { ambient 1.0 }
 }
 hollow
}

plane {
 y, 0
 texture {
  pigment { rgb 0.5 }
  finish { ambient 1.0 }
 }
}

#default {
 texture { T_Gold_5A }
}

sphere {
 y*1, 1
}

camera {
 location <3, 3, -3>*0.7
 look_at y*1
}

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