"the wall is not for sale" Buenos Aires, Argentina
This is evidence of stolen street art. Someone had the brilliant idea to come to argentina and remove pieces of graffiti art from the walls in which they were painted. More often than not the work was painted on behalf of the owner of the building/wall. Basically he transfered the paint onto glass and then had the audacity to create a gallery opening featuring said stolen work. The artists heard about this and crashed the opening with fire extinguishers destroying all the pieces.