It started with one shot. At 8:46 a.m., Jules Naudet, a rookie filmmaker making a film about a rookie firefighter, was practicing his camera work. He heard a roar overhead and pointed his camera up. Kenneth T. Jackson, the president of the New York Historical Society, believes that was the only camera that captured American Airlines Flight 11 hitting the north tower.
Then the number of photographs rose exponentially. As many as 100 cameras captured United Airlines Flight 175 flying into the south tower, Mr. Jackson said. Thousands of cameras caught the towers falling, and hundreds of thousands recorded the aftermath on that day.
Now, he said, "It is the most documented event in human history."