James Mollison's photo projects are based on smart, original concepts applied to serious social and environmental themes. For his latest book, Playground, Mollison has photographed children at play in school playgrounds, inspired by memories of his own childhood, and interested in how we all learn to negotiate relationships and our place in the world at a young age through play. For each picture, Mollison sets up his camera during school break time, making multiple frames, and then composing each final photograph from several scenes, in which he finds revealing "play" narratives. With...