Slate Star Codex discusses postmodernism.
I think Scott actually does a good job explaining some of these concepts. The metaphor at the end is a bit iffy, but overall a nice example of the Principle of Charity.
At the end of the day, the best way to learn postmoderism is to read the postmodernists: Foucault, Deleuze, Derrida, even Merleau-Ponty and Nietzsche.
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