Is it possible to have 2 parallel planes with the light source and camera
between them? So that it would look like a horizon, with the plane above meeting
the plane below off in the distance.

I've tried variations of this code:
plane { <0, 1, 0>, -1
 pigment {
  checker color Red, color Blue
 }
 texture { T_Stone25 scale 4 }
}

plane { <0, -1, 0>, -7
 pigment {
  checker color Blue, color Green
 }
 texture { T_Stone25 scale 4 }
}

Thinking the normals of the planes would be opposing each other (hence y is 1
for bottom plane and -1 for top plane). Reference says the distance value is how
far along the normal from the origin. So if the normal is going y-negative, I'd
need a negative number to bring the plane back 'up' above the camera and light
source.

But I can't seem to make this idea work. Suggestions?

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