How the late night talk show set became an American icon

For more than six decades, American late night talk show hosts have sat behind large wooden desks, with guests in cushioned chairs or couches to their right. Behind them, the wall may be painted to mimic an open vista; around them, a brightly lit studio set is made more inviting through warm wood tones, mugs on a desk or — in Johnny Carson’s case — a couple of well-placed house plants.