I have a very plain design:
- a bluish background color
- a red sphere
- a bluish plane sitting beneath the sphere (same color as the background)

All I want is for the plane to reflect the ball, but not any other light: a
simple "reflection plane" that is otherwise invisible. The following plane
works, except that the reflection doesn't fade out--it's just a solid
reflection.

How do I make the plane fade-out the reflection over distance?

plane {
  <0, 1, 0>, -5
  pigment { color hex2rgb("E6E8FA") }
  finish { ambient .9 diffuse 0 brilliance 0 reflection .1 }
}

Thanks in advance for any ideas! This is probably a newb question. :-(

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