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See this "reverse graffiti" - someone washes some dirt off a car tunnel wall to create images.

It gets hosed off shortly after.

Thanks for sharing that - never seen it before. I like that it gets something accomplished if it needs to be removed. Reminds me of the pothole artist in Chicago.

http://chicago.curbed.com/archives/2014/11/03/chicagos-potho...

I've seen this used for advertising. Stencil on the sidewalk + a pressure washer.

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