While visiting Arches National Park I was setting up to photograph a feature called Double Arch. As I was looking through my camera a young boy came running past me and into the camera view. When this occured I thought this may be an interesting add to the photo so I took it. The boy's parent were behind me walking slowly pushing a stroller with a baby on board. They apologized which was not an issue for me. When looking at the photo later I thought the boy in the picture added to the shot by giving a sense of size to the Double Arch. Camera was a Canon 7D with a Canon 17-55 f2.4 lens on a tripod at 17mm. Settings as follows.Aperture was 7.1, speed was 1/250 sec and ISO was at 100.