Modernity, in the simplest terms, is History. It is the conflict of grand narratives that shaped the lives of the citizens of the 20th century. Systems of government, national identities, religions, racial and tribal identities, mythologies; these are the social realities that shape history, the grand narratives that define modernity. In a modern culture, all meaning flows out from the grand narrative like a tree, each branch being a new interpretation, and each leaf being an idea. All experience, all knowledge, all understanding flows back to the trunk of the grand narrative, and all reality is understood through the social agreement of which grand narrative to apply.
Postmodernity, however, Jean Baudrillard points out, is where grand narrative breaks down, replaced instead by a system of small narratives, combining and intermingling to take the place of the defunct grand narrative, and creating meaning, not from a hierarchical dogma, but from personal mythology built from the found intellectual objects of society, recombined, recontextualized, and given new meaning in their use, rather than meaning being handed down from a grand narrative. Postmodernity is slang, the mash-up, the in joke, the meme, rather than the sermon, the dissertation, the lecture, or the speech, which defined the truth of modernity. As Hiroki aptly describes it, if modernity can be viewed as a tree of grand narrative, then postmodernity is best viewed as a database of small narratives.