A long essay on Errol Morris’ long, three-part investigation of a Roger Fenton photograph: “Fenton’s mild rearranging of some cannonballs presumably went unremarked because no one at the time would have thought it worth remarking on. To subject him to the standards of our own time is otiose; it’s like complaining that Wagner’s Ring cycle is missing a backbeat.” But, then again, that’s rather beside the point: “I don’t care why he chose to pursue this particular topic at such fantastic and disorderly length. It’s a great thing to find in a newspaper.”