“Blueberries” moves forward artfully, telling the true tale of the pictures and their march through public consciousness. The photographs show Nazis at ease at the site of the world’s most famous death machine. The Nazis lounge at a chalet, flirt with the secretarial pool, offer cheese smiles to the camera. None of the camp’s Jewish prisoners are pictured in the photographs, only their murderers, in the moments between murders. The album is a placid, subtly horrifying log of the mundane aspects of those people’s daily lives.