Banksy is a world renowned graffiti artist from the UK, we don't even know for sure if he is one person, since he seems to be good at everything from molding fiberglass to cement sculpture to good ol' spray can art.
If he spray paints your wall and claims responsibility you can sell that piece of your wall for tens of thousands of dollars.
So, artist or vandal?
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Both. Some of his art is great, but I'm sure people would appreciate if he didn't do it on their stuff. He's also a bit of a hypocrite if you watch Exit Through The Gift Shop; dude is all into antiart and being anti-mainstream, but he's , and the guy he accidentally mentored and politely distances himself from is pretty much doing the same bullshit he is, but without pretending to be hella deep rebel guy (per se).