Levi Strauss' theory of binary opposites proposes that narratives are driven by opposing forces, such as heroes and villains, that are in conflict until a resolution or balance is reached. Some examples of binary opposites include light and dark, good and evil, human and alien. Horror films often use binary opposites, like Paranormal Activity which contrasts the natural and supernatural as well as night and day, and Jennifer's Body which opposes good and evil between the main characters.