Banksy is an England-based artist best known for his awesome political street art (usually stencil work displaying his contempt for the government in labelling graff as vandalism).
No-one seems to know his true identity, or what he looks like in real life, but his work is out there on walls both on the street, and in exhibits in so many countries, it’s even found on blank gift cards at your local newsagent (usually sold without his permission). His official book though makes a great addition to any bookshelf, or coffee table too.
Links:
http://www.banksy.co.uk