(Accepted for publication 16 August 2016)

For Jacob A. Arlow, understanding unconscious fantasies was central to his clinical work. These fantasies are to be found at the core of those eruptions that break without warning into our ordinary lives, whether in the form of hysterical symptoms, daydreams or nightmares. What, however, could an unconscious fantasy be on a theoretical level, beyond a vehicle for discharge? Although partly unconscious, such fantasies are sometimes composed of fixed verbal content with a high degree of internal organisation. Unconscious fantasies therefore pose many challenges to understanding.