I was thinking about this photo this morning. I was initially taken in by the shadows cast by the trees, and that's what I initially commented on. In retrospect I think @Dave Farnes correctly identified the more interesting aspect of the photo: the straight-line shadows cast by the lampposts. They cut through the crazy lines of the tree limbs as if to contain them. It's a really fine photograph, @Rob MacKillop.
I'm pleased I came late to this and so could read the discussion. It has probably influence my viewing as I no find myself looking at the line of the shadow of the lamppost and the way it takes your eye up the actual post and into centre of the image. Nice.