When graffiti artist Strook decided to create a piece for De Invasie, a series of artworks based around ecology, he grabbed a high pressure hose instead of an aerosol can and removed the moss from the wall, one line at a time, to create this awesome mechanical bird mural.

You can see more photos of this reverse graffiti piece at the link below, including shots of Strook at work on the wall and close-up detail shots so you can more fully appreciate the linework that went in to creating the mural. I wonder if law enforcement agencies will vilify this form of clean graffiti as they have with other forms of street art?

Link Strook's website