Volumes four and five of the standard edition both constitute Freud's seminal work 'The Interpretation of Dreams'. This is probably Freud's most popular work and, if we maintain Freud's own logic, that what is remembered is most important, it perhaps also his most important work. Freud presents numerous case studies of patient's dreams and takes the reader through his process of interpretation. The work not only suggests how we might interpret dreams themselves but also reveals Freud's fundamental understanding of the structure and functioning of the psyche; the primary processes of condensation, distortion, and representation and figurability as well as secondary revision. These process not only affect dreams but all memory and experience.