Cause clearly they're gonna need to keep making them:
The person who posted the pic swears he's not the one who makes you scream out into the night when you can't find that killer party on Clarendon cause you can never remember which one is Clarendon and which one is Ostrom.
Not sure if those are blank spots for incoming signs so valuable they must get prime real estate on the wall (Mt. Olympus Drive?) or street signs so nefarious that to know which one they are would be too much to bear so they're turned upside down.