Stalking fish in a crystal clear chalkstream in spring when there is little bank side cover for the [very tall] angler can consume all of your attention. Staying out of sight is one of my priorities. It's either that or trying to look to the fish like a convincing 6' 10" heron... exactly, not likely. But occasionally when I look up I see the most beautiful scenes, like this viaduct. Sometimes man made stuff can be beautiful and complement the wildlife.