Wet Pain
Due to the amount of graffiti in my neighborhood they paint the train station walls (parts of them) every single day.
Here is one of the walls as observed as CL and I were heading into Manhattan to shop for spiked leather bracelets. You can see that not only did the MTA only use the paint to cover graffiti and not wall rot (which is just as unsighlty or more), but that the "wet paint" sign has been re-engineered to be part of the constant expression that the wall is an unwitting participant in.