idée fixe

idée fixe, in music and literature, a recurring theme or character trait that serves as the structural foundation of a work. The term was later used in psychology to refer to an irrational obsession that so dominates an individual’s thoughts as to determine his or her actions. An outgrowth of Romanticism, the concept enjoyed its widest circulation during the 19th and the early 20th century. The notion of idée fixe arose in France in the...