 Paranoid fiction often overlaps with many other genres, most commonly dystopian fiction, science fiction, and film noir, sharing many of its main themes and literary devices.Generally, however, paranoid fiction avoids explicitly defined themes and concrete motifs in favor of allegories and ambiguous symbolism to emphasize the dreamlike and unreal nature of the characters' world.For example, a purely dystopian work typically explores the mechanisms and motives of the totalitarian state to keep its people under control, whereas one of paranoid fiction would concentrate more on the effects of the state on its inhabitants' mental and emotional well-being, and its implications on the decadent condition of society.