Here it is paired down to a minimum. In the Sphere pigment, what does
the stand-alone "1" do? I can't figure it out in the Manuals. 

This is strange!

camera {
    location <0, 0, -2>
    look_at <0, 0, 0>
  }

  plane { z, 4
    pigment { checker color rgb 0, color rgb .3 }
    finish { ambient 1 diffuse 0 }
    scale 0.5
  }

  sphere { 0, .5
    pigment { rgb <0,0,0> 1}
  }

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