OK, I decided to post one more photo of the DC Metro.
This photo is from a station where the platform for both directions of traffic is centered between the train tracks as opposed to having platforms on either side of the tracks. While sitting on a bench waiting for the train one day, I noticed that if you lean back just enough and look down the length of the platform, you get a pretty awesome symmetrical perspective of the station. The cement back of the bench lines up with the corner of the air conditioning unit/name post and with the center seam of the ceiling, making it look like everything in the ceiling and walls and floor emanates from that post. Pretty cool. :)