It was only when the founder of psychoanalysis, Sigmund Freud, first published his book, The Interpretation of Dreams, at the turn of the nineteenth century that widespread interest in dream interpretation took off. He argued that the subconscious was speaking to us in our dreams in order to play out wish fulfilment, something that may not always be direct or obvious according to the nature of the dream. His famous colleague, Carl Jung, developed and refined these ideas to an extent, arguing that dream interpretation should be more focussed on a wider range of mental complexes which spoke of a dialogue between the self and the ego.