Some things just make sense.

I can't get enough of stuff on trains. You have no idea where they came from. A canvas on wheels. Anywhere between a coalmine and a powerplant you can find one and that is all the context you get.
Good use of punctuation.
I started to wonder why the graffiti from parking garages are on the higher floors.

A bit illegible but the silver curls contrasted with the red are pretty to look at.

Think about it. The lower floors fill up first. Therefore there are less people on the upper floors to interrupt the graffiti artist in the act.
I am pretty sure if I sit here long enough I can read these.

Stencils! I love stencils. What better way to reproduce a tag in clear manner. Bonus points for making a face. Everyone has a face, easily identifiable.