Watching the World Change

The terrorist attack on the World Trade Center was the most universally observed news event in human history. That the event was so visual is owing to the people who, facing disaster, took photographs of it: imperiled office workers, horrified tourists, professional photographers risking their lives. Conceived by Osama bin Laden as the toppling of an image of America right before the world's eyes, the tragedy swiftly came to be defined by photography, as families posted snapshots of their loved