Much appreciated.  :cool:

I have a question about the spot light showing through the window...  It lit up the square on the red wall, but it also lit up the wall around the the square too.  Was that acting sort of like ambient light, because of the bright square that was lit up?  If not, can you please clarify what was causing the rest of the wall to light up?  Thanks.

The added bemefits of this are superior lens usage in that we're not compressed into super wide focal lengths like 20m/m but , rather, can shoot long and maintain or even compress perspectives.

As we can see the shadow is useable though we cannot simplistically have a window in that wall even if there is a real window in the actual wall and we replace it with a wall decoy (as here) to simulate the lighting because 1 sided walls with transparentised areas leave messy edges visible from the shooting side of the cam-facing wall and take some degree of "play" to eradicate.

By shooting with a one sided wall system you keep the normal shadows and a normal environment. If I need a wall with a window I use lighting to simulate the window incoming light plane because transparentising leaves chronic edging that alpha cannot remove because that also removes the wall obstruction to light but regardless, it works. 

Proabably an oversight. :)