Young French photographer/activist/artist, JR, (he goes by his initials), has made the urban world his own outdoor photo gallery. He's posted his billboard-size photographs -- usually portraits of people who live in the same area -- on the sides of buildings, on rooftops, wrapped around whole train cars, on the houses the cover a ghetto slum hillside, and even on the wall that divides Israel from Palestine. His work is at once compassionate and provocative. He won the $100,000 TED prize in 2011, and here is his funny yet passionate speech about how he tries to use art to change the world. Inspiring!
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You can also see more of his work, and listen to an early audio interview he made with Lens Culture in 2007: lensculture.com/jr