Sometimes paranoid fiction will strongly imply, and occasionally admit outright, that its constructed world is a lie or an illusion. In this case, the plot will center on the main character's struggle between the physical and spiritual; i.e. the actual world they are in, versus the world they want to see and believe in. Here, the cause of the fantasy is the protagonist's internal desires, doubts, and suspicions. Such works tend to be more introspective and focused on the individual, than on a community or a regime.