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Postmodernism is largely a reaction against the intellectual assumptions and values of the modern period in the history of Western philosophy (roughly, the 17th through the 19th century). Indeed, many of the doctrines characteristically associated with postmodernism can fairly be described as the straightforward denial of general philosophical viewpoints that were taken for granted before or during the 18th-century Enlightenment.

There is an objective natural reality, a reality whose existence and properties are logically independent of human beings—of their minds, their societies, their social practices, or their investigative techniques. Postmodernists dismiss this idea as a kind of naive realism. Such reality as there is, according to postmodernists, is a conceptual construct, an artefact of scientific practice and language. This point also applies to the investigation of past events by historians and to the description of social institutions, structures, or practices by social scientists. The descriptive and explanatory statements of scientists and historians can, in principle, be objectively true or false. The postmodern denial of this viewpoint—which follows from the rejection of an objective natural reality—is sometimes expressed by saying that there is no such thing as Truth.