Death Cab for Cutie's "Codes and Keys"

Death Cab for Cutie's Codes and Keys has a really unusual design for the album art. The main focus is on what looks like a key from a keyboard of the pound (#) sign. Here, however, the "key" has some kind of texture and the # is carved through. Something about the contrast between the rough texture of the key and the lack of texture/ color where the # is really appeals to me. I think it's because the lines of the # are sharp and clean, with smooth edges, and the contrast between this  and the rough texture is really interesting.