I hadn’t heard of Flash Graffiti before as a term, though I have seen other artists project onto walls and embassies. (I remember in particular there was an artist during the apartheid era who flashed images at night on the South African embassy in London.) It is quite subversive, and though it is harmless as a ghost, still, it makes its mark, as this article, shows: Chinese Army Unhappy Over Ai Weiwei ‘Flash Graffiti’ from ANIMAL:
As if Chinese authorities weren’t angered enough by the rash of pro-Ai Weiwei stencils popping up all over Hong Kong, someone is now projecting the same message on unauthorized locations around the city, including the barracks of the People’s Liberation Army.
(Discovered via Andrew Sullivan.)
Smart People I Know 