In this original work of psychoanalytic theory, John Muller explores the formative power of signs and their impact on the mind, the body and subjectivity, giving special attention to work of the French psychoanalyst Jacques Lacan and the American philosopher Charles Sanders Peirce. Muller explores how Lacan's way of understanding experience through three dimensions—the real, the imaginary and the symbolic—can be useful both for thinking about cultural phenomena and for understanding the complexities involved in treating psychotic patients, and develops Lacan's perspective gradually, presenting it as distinctive approaches to data from a variety of sources.