The Postmodern period in literature began after World War II. This period is characterized by the expression of feelings of anxiety and alienation experienced by individuals living in the 20th century -- Postmodern tends to be darker, suggesting meaninglessness of the human condition in general through radically experimental works that defy convention of literary cohesion and even coherence. Postmodern novels fitting this description are often referred to as antinovels. The Postmodern era realizes humans' potential for mass destruction and its shocking history of genocide, and evokes continuing disillusionment. Postmodernists frequently stress that humans desperately and unsuccessfully cling to the illusions of security to conceal and forget the void on which their lives are perched.