Even with what seem to be more "familiar" subjects, my interest remains more about the abstract play of the shapes, lines, colors and textures of what's being photographed.
I think it's the "accidental"--the things that you didn't see, or perhaps didn't consciously see, that you then discover in you work--that differentiates photography from other art forms.
For example, the fact that the white tower in the "Behind the Phillips" image above turns out to be topped by a skylight--which can be viewed through the rectangular window in front--is something I didn't see until I got back the proof enlargement.