With a nonstop news cycle, the advent of digital photography, and the Internet all converging, 9/11 was perhaps the first tragedy experienced immediately worldwide. David Friend explores the meaning of the day's overly familiar and unfamiliar imagery from news coverage to amateur photos in Watching the World Change. Target Audience Photo buffs and news junkies. Worth It? An impressively sweeping analysis. When it comes to 9/11, no, we haven't seen everything.