Graffiti artist Mobstr tells the story with pictures of his grand experiment taunting authorities:
I cycled past this wall on the way to work for years. I noticed that graffiti painted within the red area was “buffed” with red paint. However, the graffiti outside the red area would be removed via pressure washing. This prompted the start of an experiment. Unlike other works, I was very uncertain as to what results it would yield. Below is what transpired over the course of a year.
It went like this:
Continue to next page to see the rest.
via huh magazine. Thanks Eric