Street artist Mobstr recently shared a photo story that took place over the course of a year. The artist explains:
“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, graffiti outside of 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.” 
MOBSTR
Instagram 
Street Artist mobstr and City Worker Have Year Long Exchange on Red Wall in London (1)
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Street Artist mobstr and City Worker Have Year Long Exchange on Red Wall in London (30)