With the camera and light above the following boxes, BoxA shows up as white
media, which is what I expected, but BoxB shows up as black - why is this?
After all, if you are looking down at a cloud from an airplane, beyond a
certain point the actual physical thickness of the cloud is not
particularily significant (is it?).

#declare BoxA =  // nice 'n' white
box
{
  <-10000, -1, -10000>
  < 10000,  0,  10000>
  pigment{rgbf<1,1,1,1>}
  hollow on
  interior{media{Plain_White_Scattering_Media}}
}

#declare BoxB = // completely black
box
{
  <-10000, -10000, -10000>
  < 10000,  0,  10000>
  pigment{rgbf<1,1,1,1>}
  hollow on
  interior{media{Plain_White_Scattering_Media}}
}

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