An eidolon is a term used to describe a phantom or apparition, often representing a spirit or an idealized image of a person. In various cultures, eidolons are seen as manifestations of the soul or a reflection of one's inner self. They can symbolize the connection between the physical world and the spiritual realm. In literature and art, eidolons often serve as metaphors for longing, memory, or the unattainable. They can represent the way individuals perceive others or themselves, highlighting themes of identity and existence. The concept is closely related to ideas found in mythology, psychology, and philosophy.