The Shadow

I was photographing an empty house that is for sale, and I am always looking for the "something else" photo, in addition to the photos needed for work. While I was framing this white-on-white composition, the real estate agent walked out the room to the left. I saw her shadow on the door, and asked her to go back in to that room and pause so that I would have the mysterious shadow on the door. Subtle, I thought, but makes it kind of interesting.