One of those grey areas is that there's a large portion of people who do pixação that see their art as an art form. As an aside, I remember a short Brazilian d

One of those grey areas is that there's a large portion of people who do pixação that see their art as an art form. As an aside, I remember a short Brazilian documentary on São Paulo's "reverse graffiti" (doing a drawing or mural by skillfully removing dirt from a dirty wall, so that the white spaces create an image) where the police detained the artist doing it, despite the fact he was literally cleaning the wall.