This is a blog post by Errol Morris that appeared on the New York Times site back in September. In it, he discusses the famous Roger Fenton photo "Valley of the Shadow of Death". It's a very interesting discussion about manipulating a scene. This blog post has 3 parts to it, and has received over 1100 comments.

Here is a link to the post.

http://morris.blogs.nytimes.com/2007...-egg-part-one/