It's been nearly a century since Marcel Duchamp exhibited a urinal and called it art. Since then, contemporary art has expanded to include just about any object, action, or event: dance routines, slideshows, and functional hair salons. In The Contemporaries: Travels in the 21st-Century Art World, painter Roger White explores why, how, and by whom art gets made, how it is evaluated, and how today's artists will be remembered.