The term outsider art has been used to describe work produced exterior to the mainstream of modern art by certain self-taught visionaries, spiritualists, eccentrics, recluses, psychiatric patients, criminals, and others beyond the perceived margins of society. Yet the idea of such a raw, untaught creativity remains a contentious and much-debated issue in the art world. Is this creative instinct a natural, innate phenomenon, requiring only the right circumstances such as isolation or alienation in order for it to be cultivated? Or is it an idealistic notion projected onto the art and...