Originally Posted by
Mike Buckley
Considering that you've taken a peek or two at my photos of clear glass, keep in mind that you can use the white wall to define the edges of the glass with bright light against a dark background. You do that by placing the light source directly behind the background facing the wall. The light that reflects off the wall goes around all sides of the dark background and defines the edges of the glass. My point is that even though the background of the scene is dark, you're using the white wall behind it to help light the subject.
Naturally, you can use that white wall to reflect light in all sorts of situations that are far more typical.