Psychologist Mihaly Csikszentmihalyi’s famous investigations of “optimal experience” have revealed that what makes an experience genuinely satisfying is a state of consciousness called flow. During flow, people typically experience deep enjoyment, creativity, and a total involvement with life. In this new edition of his groundbreaking classic work, Csikszentmihalyi demonstrates the way this positive state can be controlled, not just left to chance. “Important. . . . Illuminates the way to happiness.”—New York Times Book Review