Here's a video of stealth artists in Riga, Latvia, doing reverse graffiti, or pressure-washing dirty walls into (sometimes) meaningful patterns. The concept originated with British artist Moose, who's been cleaning English walls and pissing off English councilmen since the early 2000s. His brought the idea to a wider audience in 2008, with a documentary that showed him cleaning the San Francisco Tunnel into the shapes of flora and fauna that would have grown in that area thousands of years ago. Whether the Latvian equivalent is as pointed, we can't say. But there are pretty flowers!
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