When you paint images not with spray cans or pigment, but instead by cleaning dirt and pollution from public places in artistic patterns - painting the image by removing dirt - this is reverse graffiti. This defaces no surface, and in fact starts to clean what a city should have cleaned to begin with. […]

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Beautiful street art in Moscow and Brazil (not sure where). From Funny Picture Crazy.
Brasilian street art
and
Moscow street art

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