Bansky in context. What are you looking at?

My only real Banksy picture. Real, I mean in context. Urban context. Out of a gallery.
Okay, it might not be the most impressive graffiti work, but it is quite conceptual. I wouldn't have known this was a Bansky piece, if it wasn't for http://banksyforum.proboards.com/index.cgi?board=wallpapergallery&action=display&thread=14826
"What are you looking at?" is next to the public toilets near Marble Arch, London, UK.