> // Left Wall
> difference{
>  box{
>   <-11,0,-12>,<-10,10,12>
>   texture{
>    Wall_Texture
>   }
>  }
>  box{
>   <-12,0,-1.5>,<-9,8,-8>
>   texture{
>    pigment{
>     color White
>    }
>   }
>  }
> }


the size of the cut out is the size of the box
i.e. box{<-12,0,-1.5>,<-9,8,-8>} is a cube 2 x 8 x 6.5
to make it smaller you have to change the coordinates in relation to each
other

i.e.  box{<-12,0,-6>,<-9,8,-8>} = 2x8x2
or    box{<-12,0,-1.5>,<-9,8,-3.5>} = 2x8x2

the only difference between these two is their location (corner at
<-12,0,-6> vs {<-12,0,-1.5>)

remember the vectors of the box represent the beginning and end points of
the cube not the size, the size is the difference between these points.

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