Modern novels from the late 19th/early 20th century realistically depicted psychological aspects of life and contained a sense of pessimism. Key modern authors included Thomas Hardy who explored fate in novels like Tess of the d'Urbervilles. Postmodernism emerged in the 1940s incorporating elements like parody, playfulness and black humor. Notable postmodern authors were Joseph Heller, Kurt Vonnegut, and Thomas Pynchon who blended genres to critique aspects of modern society like war and consumerism. Postmodern novels by Tim O'Brien incorporated both fiction and reality from his Vietnam War experiences.