> Ah, this makes sense.  I will try that.  The strange behavior I'm seeing is
> consistent with your explanation.

I got it.  The snippet below works as expected.  The 'emission' is because I'm
using radiosity and want the shadow cast onto the floor to be a tad less dark,
'diffuse' limits how bright the floor is.  Thanks for the help.
========================================================

plane {
  y, -4
  pigment {
    image_map {
      jpeg "wood.jpg"
      map_type 0
    }
    rotate 90 * x
  }
  finish {
    specular 0.0
    diffuse 0.45
    emission 0.06
  }
  scale <53, 1, 53>
  rotate <0, 65, 0>
}

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