The Shepard Fairey mural on the Houston Wall has a big red target in the middle of it. After being tagged by NAW, the mural has been targeted by another--literally. Someone launched a projectile through it--a rock, maybe a brick.
Not quite a bull's eye.
If you look closely, you can see some color inside that hole.
If you look really closely, you can see it's the Os Gemeos mural hidden behind the Fairey (this guy's necktie, to be exact).
The Fairey mural was not pasted directly on the wall, but on a built-up wall on top of the wall. Give it a knock--it's hollow. I guess they better put that security guard on duty 24/7.