#declare Walls = union {
// Floor:
object {                                          
	plane { y, 56 hollow }
	texture {
		pigment { color rgb <0.3,0.3,0.3> }
		finish { ambient 0.01 diffuse 1 }
	}
	photons { collect off }
}  

//Ceiling
plane { y, -200.0 hollow
        texture {  
                pigment { color rgb <.1,.1,.1> }
                finish { ambient 0.01 diffuse 1 }
        }
}


//Wall Right
plane { z, 200.0 hollow
        texture {  
                pigment { color rgb <.1,.1,.1> }
                finish { ambient 0.01 diffuse 1 }
        }
}

//Wall Left
plane { x, -200.0 hollow
        texture {  
                pigment { color rgb <.3,.3,.3> }
                finish { ambient 0.01 diffuse 1 }
        }
}

}