Errol Morris writes several hundred words about two iconic photos taken by Roger Fenton during the Crimean War, during which he explores the interplay between "clear" evidence and the interpretation of that evidence by people with different agendas and ideas.
As I've said elsewhere: Nothing is so obvious that it's obvious. When someone says that something is obvious, it seems almost certain that it is anything but obvious - even to them. The use of the word "obvious" indicates the absence of a logical argument - an attempt to convince the reader by asserting the truth of something by saying it a little louder.
This might be the best blog post I've ever read. I can't wait to see Standard Operating Procedure, Morris' upcoming documentary on Abu Ghraib and, from what it sounds like, the culmination of his exploration of truth in photography.