This article contends that the central principle of modern philosophy is obscured by a side-debate between two opposed camps that are united in accepting a deeper flawed premise. Consider the powerful critiques of Kantian philosophy offered by Quentin Meillassoux and Bruno Latour, respectively. These two thinkers criticize Kant for opposite reasons: Meillassoux because Kant collapses thought and world into a permanent “correlate” without isolated terms, and Latour because Kant tries to purify thought and world from each other rather than realizing (...) that they are always combined in “hybrid” form. What both critiques tacitly accept is the notion that “thought” and “world” are the two major poles of the universe. I claim that this stems from the post-Cartesian assumption that thought and world are the two basic kinds of things that exist. The name “onto-taxonomy” is introduced for this view. (shrink)