> Is there such a thing as a "rectangle", rather than a "box"?
There's polygons.

polygon {
   4,
   <0, 0>, <0, 1>, <1, 1>, <1, 0>
   texture {
      pigment { image_map { png "plasma2.png"  } }
      finish { ambient 1 diffuse 0 }
   }
    //scale and rotate as needed here
}

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