There is no doubt that phantasy or unconscious phantasy , as it started to be used in the English translation of Freud’s work in the late 1920s and 1930s to differentiate it from fantasy , is one of the most important theoretical and clinical concepts of psychoanalysis.‘- Riccardo Steiner, from the IntroductionIn this outstanding new collection, the vital concept of unconscious phantasy is debated and examined by such luminaries as Joseph and Anne-Marie Sandler, Jean Laplanche, J-B Pontalis, Susan Isaacs and Hanna Segal. Sigmund Freud’s seminal paper Formulations of the Two Principles of Mental Functioning heads an impressive collection and provides a welcome reminder of the beginnings of this theory. The inherent difficulties in translating Freud’s work have contributed to the conflicting interpretations that are so illustrated so well in the following articles. By collecting together such diverse opinions of Freudians, Kleinians, Lacanians and Neuroscientists on unconscious phantasy, Riccardo Steiner has created a fresh and compelling elucidation of this fascinating subject.