Roger Fenton /Smithsonian/AP

Some believe photographer Roger Fenton placed the cannonballs on the Ukrainian road during the Crimean War himself.

September 17, 2011

Errol Morris is regarded as one of the world’s most important filmmakers and is best known for his documentaries The Thin Blue Line and the Oscar-award winning Fog of War.

But before he was a filmmaker, he was a detective and he’s always been interested in uncovering the mysteries of photographs. In his new book, Believing Is Seeing, Morris focuses on the things you can’t see in photographs and the importance of what lies outside the frame.

Morris tells weekends on All Things Considered host Guy Raz that his obsession with photos began when he was a small boy and his father died.