Artists spend two or three days, on hands and knees, meticulously creating elaborately detailed chalk and pastel paintings on an asphalt or concrete canvas -- only to have it washed away after they're done.
Street art is intrinsically bound with its neighborhood and location in a city. Context and placement are key. So when a street artist is asked to create art about mapping a place, it is fascinating to see how they perceive it and with what manner and medium they present it.
Seven installations by Chinese dissident artist Ai Weiwei sprout amid the rusting steel bars, broken windows and peeling paint of a cellblock, a dining hall, hospital ward, and a forced labor facility.
In the West it can certainly feel like street art has become so ubiquitous as to have come to, rightly or wrongly, something of a dead end. But in China, where at present there is no specific law against street art, the genre is little understood.
Ankore roams the streets at night, looking for a wall to paint. During the day, he's a soft spoken, earnest guy from Central America who works in a factory for minimum wage; when the sun sets, he finds a wall and begins to passionately paint.