For instance, a shot of a character looking at his reflection in a mirror can also signify the concept of a divided self and internal conflict, because of the symbolic meanings associated with mirrors and reflections in psychoanalytic theory; this is a common visual trope found in many films dealing with characters who have personality disorders or are suffering internal conflicts. Image system also has a much simpler definition, most often used by filmmakers and screenwriters; it refers to the use of recurrent images and compositions in a film to add layers of meaning to a narrative. The repetition of images can be a powerful tool to introduce themes, motifs, and symbolic imagery that might or might not be explicitly dealt with within the plot of the film.