Are you ready to see another abstract? This one is not quite as abstract as the others I have posted, but still may make you wonder just a bit as to the subject matter. This particular one is a close up of a large fuel storage tank. The sun was nearing the horizon which gave some very interesting shadows to the image. I especially like the shadows of the stairs near the top as they elongate due to the curvature of the tank.
Canon 40D, Canon 24-70 f2.8 L at 70mm, 1/500 at f4, ISO 100