In Frank Jackson's famous thought experiment, Mary is confined to a black-and-white room and educated through black-and-white books and lectures on a black-and-white television. In this way, she learns everything there is to know about the physical world. If physicalism--the doctrine that everything is physical--is true, then Mary seems to know all there is to know. What happens, then, when she emerges from her black-and-white room and sees the color...