Yeah, I wasn't clear about the photo. You've got to know it; it's a postwar French(?) shot of either someone descending down a staircase or riding a bicycle through an alley as visible down a staircase. It's black and white, and has an extreme overhead sort of look. It's a famous photo, hanging in the Tate Modern or something.
Anyway, someone posted it on Flickr in one of the photo critique groups without identifying it. Not only did nobody know what it was, but to a man they lambasted its technique, composition, etc. It was actually pretty hilarious.