Render the following and then can someone tell me why the wall is visible
when behind the media.

#include "colors.inc"
camera {
   location <-2, 0, -3>
   look_at <0,1, 0>
   }
light_source { <0,10, 0>
  color rgb <1,1,1>}
box{ <-1,-.6,-1>, <1,9.5,1> pigment { rgbf <1,1,1,1> } hollow interior
    { media
      { emission  rgb <0,.1,.2>}
      }
      }
difference{
box{ <-1000,9.5,-1000>, <1000,9.6,1000> pigment {Black}
  }
box{ <-1,9.4,-1>, <1,10,1> pigment {Black}
  }
 }
box{ <0,-100,50>, <30,0,51>
  pigment {rgb <1,1,1>}
  }

thanks for any help.

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