There is so much visual stimulation all around us.  When something catches your eye you have to go with it.  I have always been enthralled with windows and light and the shadows windows make on the wall and things.  I love looking into a window - it is like looking through the viewfinder of your camera!  I saw that another photographer had taken a shot through these doors and windows and I could not let go of it - I had to play with it myself.