Graffiti good and bad

As I’ve said before, I love graffiti.

In Paris, I saw both the good and the bad. I think the left example is bad. A really picturesque neighborhood was hurt by that personal expression. (And interestingly, it was about six stories above street level, so very few people see it.)

The poster, however, had very creatively applied graffiti.

What are some examples of good and bad graffiti you’ve seen?