// Enclosing UNION to allow for easy transformation of the scene
union {
  // The floor
  plane { y, -2 }
  // The light in the doorway
  light_source { <0,2,7>, rgb 1 }
  // Left side doorway
  box { 8*z-2, <-3,3,9> }
  // Right side doorway
  box { <2,-2,6>, <3,3,9> }
  // Set to a lower number, this moves the bars to the right
  #local i = -2.6;
  // looping to create the bars
  #while ( i < 2 )
    // UNION this for easy translation
    union {
      // the vertical bars
      box { <.2,-1,.1>, y }
      // the horizontal bar
      box { (z-y)*.1, x }
      // here we use the iterator
      translate <i, -1.2, 3>
    }
    // Iterate for the next bar
    #declare i = i + 1;
  // End loop
  #end
  // Set the color this high, instead of making a seperate DIFFUSE statement
  pigment { rgb 1.5 }
  // An AMBIENT raises the brightness and lowers the contrast. Both bad things
  finish{ambient 0}
  // The stone look to the scene
  normal { bumps scale .02 }
  // rotate the scene so there's no need for a CAMERA{LOOK_AT <>)
  rotate -39*x
// End of the scene UNION
}