Postmodernism developed as a reaction against modernism and its ideals of progress, reason, and objective truth. There are three approaches to understanding postmodernism: historical, stylistic, and theoretical. The historical approach views postmodernism in relation to modernism and key events like World War I and II that eroded beliefs in science and human progress. Theorists like Lyotard, Baudrillard, and Jameson established postmodernism theoretically by rejecting grand narratives, arguing reality is mediated through images, and seeing postmodern works as lacking depth. Stylistically, postmodern works are playful, blur genres, and reference other works through parody and pastiche.