A recurrent image in a literary work is called a motif. It is a recurring object, symbol, or idea that is used throughout the work and serves as a unifying element. The motif often reinforces the themes of the work and can provide insight into the characters or plot. It is different from the theme, which is the main idea or message of the work, and the mood, which is the emotional atmosphere created by the work. An episode refers to a specific section or event within a larger work.