In 1996, photographer Bob Thall--walking to his car after completing some work in downtown Chicago--was stopped by something. "I noticed this strange view down an alley," he later wrote. "It wasn't the type of photograph I was doing that year, but the scene stopped me. I had one sheet of film left and thought, 'Oh, what the hell, ' and took the picture." Thall didn't print that picture for over a year. He had just published the highly-praised...