Samuel R. Delany is a unique science fiction author who has incorporated postmodern ideas into his work. For example he has used the idea of the paradox of finding completeness in a system that closes off possibilities for action in order to be complete itself. He applies this idea to describe the various different societies that can develop on space colonies outside of the planet Earth. These colonies have utopian characteristics, but those who try to find fulfillment in these societies fail because these systems must be limited in order to be coherent.