A paracosm is a detailed imaginary world. Paracosms are thought generally to originate in childhood and to have one or numerous creators. The creator of a paracosm has a complex and deeply felt relationship with this subjective universe, which may incorporate real-world or imaginary characters and conventions. Commonly having its own geography, history, and language, it is an experience that is often developed during childhood and continues over a long period of time, months or even years, as a sophisticated reality that can last into adulthood.
The concept was first described by a researcher for the BBC, Robert Silvey, with later research by British psychiatrist Stephen A. MacKeith, and British psychologist David Cohen. The term "paracosm" was coined by Ben Vincent, a participant in Silvey's 1976 study and a self-professed paracosmist.
Psychiatrists Delmont Morrison and Shirley Morrison mention paracosms and "paracosmic fantasy" in their book Memories of Loss and Dreams of Perfection, in the context of people who have suffered the death of a loved one or some other tragedy in childhood. For such people, paracosms function as a way of processing and understanding their early loss. They cite James M. Barrie, Isak Dinesen and Emily Brontë as examples of people who created paracosms after the deaths of family members. Literary historian Joetta Harty connects paracosm play with imperialism in her writings on the Brontës, Thomas De Quincey and Hartley Coleridge. Dorothy and Jerome Singer reference paracosms in their studies on childhood imagination.
Marjorie Taylor is another child development psychologist who explores paracosms as part of a study on imaginary friends. In Adam Gopnik's essay, "Bumping Into Mr. Ravioli", he consults his sister, a child psychologist, about his three-year-old daughter's imaginary friend. He is introduced to Taylor's ideas and told that children invent paracosms as a way of orienting themselves in reality. Similarly, creativity scholar Michele Root-Bernstein discusses her daughter's invention of an imaginary world, one that lasted for over a decade, in the 2014 book, Inventing Imaginary Worlds: From Childhood Play to Adult Creativity.