Warped, Waterlogged, and Beautiful “Anywhere you go, when you see disasters, people grab the pictures,” says documentary photographer Keith Calhoun. “I didn’t value my photos until after Katrina. Now every moment is of value to me because I see how quickly things can change, how nature can claim its course.” When the photographic archive of Calhoun and his wife and artistic partner, Chandra McCormick, was submerged in the floodwaters of the storm, 30 years’ worth of work was...