When you take "street art" at its literal interpretation, you get artwork that is part of the street itself. Toynbee Tiles are a form of political and societal statement art that is created by placing a tile on the asphalt, then having it embed into the street itself after the weight of thousands of cars passes over it.
This Hidden City, an excellent site that tours New York City's "esoteric side", recently collected photographs of most of the known tile locations in the City. Check out the full article for more info.
via This Hidden City
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