The beginnings of my second paper

For my second paper I've decided to write about street art, specifically the graffiti movement in NYC in the 60s–80s. I'm interested in examining the concept of "public space." Today we see quite a bit of officially sanctioned art that repurposes public space, so I want to look at how the illegality of "bombing"/"tagging" was important to the art form, but also how the concept has been reclaimed in more mainstream or at least more tacitly accepted movements, such as yarn bombing.