I like the arches within arches. This kind of pattern is both satisfying to see and also creates a kind of tension because it implies the notion of infinity.
This is one of those shots that if I were working in PS I might do entirely different BUT then it would be a different picture - that said, I like the "seeing" of this one a lot - lots of geometrics and wouldn't it be fun to see how far down you could scale a frizbee.