In 2005, Robert Burley took his big sheet-film camera and started to document the fading world of analog photography, shooting the film factories of Kodak, Polaroid, and Agfa as they began to close or be demolished. By the time the campaign came to an end this year, the film that Burley needed to make his shots was getting harder and harder to find. "I started to feel this would be the last project I could make in this way," he said in a video. Princeton Architectural Press has just released a book with 71 of Burley's images, The Disappearance of Darkness: Photography at the End of the Analog Era. This gallery presents a sampling of pictures from it, along with Burley's words on some of them.