Melanie Klein was an Austrian-British author and psychoanalyst known for her work in child analysis. She was the primary figure in the development of object relations theory. Klein suggested that pre-verbal existential anxiety in infancy catalyzed the formation of the unconscious, which resulted in the unconscious splitting of the world into good and bad idealizations. In her theory, how the child resolves that split depends on the constitution of the child and the character of nurturing the child experiences. The quality of resolution can inform the presence, absence, and/or type of distresses a person experiences later in life.

In psychology, fantasy is a broad range of mental experiences, mediated by the faculty of imagination in the human brain, and marked by an expression of certain desires through vivid mental imagery. Fantasies are generally associated with scenarios that are impossible or unlikely to happen.