Carol, this picture is superb. It is one thing to just shoot abstracted reflections of buildings within another building. It is another to organize such an image as a series of repetitive shapes, bringing rhythms into your picture and making the frame throb with vitality. This photograph goes beyond an exercise in form for its own sake. You have made an image that comments on urban architecture -- yesterday, today, and tomorrow. You are using your camera here to express ideas, and you are using it well.
