Banksy

Im assuming you guys know about the graffiti artist Banksy. If not, intro:

http://www.flickr.com/groups/banksy/pool/

and wiki

one nation under cctv.

im mapping out which ones i can take a look at while in london, not too surprised to see the more controversial ones are being whitewashed, given that councils are often puritanically ignorant and unsympathetic. however, i should have guessed that people are selling their walls after banksy paints them, ie taking down their wall, brick by brick, and selling it to galleries for a price 'worth their while.'