What is vandalism vs. public art vs. graffiti
back in the 80's - Switzerland was just waking up from being a rather backwards and very conservative little place - a guy in Zurich commited the abominable act of creating art on public walls with spray cans. He was arrested, I think he even spent some time in jail.

These days, his originals are being "curated" and he does new ones:

Harald Nägeli