Psychoanalysis is, arguably, one of the most significant contributions to the human sciences to be made over the last 100 years. With many applications to human, social and health sciences, psychoanalysis has been widely discussed and deployed within art and design practice. Post Freudian theory has brought to public awareness the agency of unconscious mental structures and irrational systems of thinking. The work of Melanie Klein is often acknowledged worldwide, as a leading contribution of UK practice. The cultural debates from 1990s to current practice have centered on the contributions made to classic Freudian theory by structuralist analyst Jacques Lacan. This collection of new essays by internationally acclaimed analysts addresses the contradictions between Kleinian and Lacanian psychoanalysis in medical, clinical and cultural practice.