# Metaphysics — Branch of Philosophy Metaphysics is the study of the fundamental nature of reality — what exists, what it means for something to exist, and the most general structures (substance, causation, identity, time, possibility) underlying everything else. Aristotle called it "first philosophy." ## Why it matters for this KB Metaphysics rarely appears under its own name in political fights, but it is the silent floor beneath them. The right's recurring appeals to a fixed human nature, a divinely-ordered cosmos, or an essential reality "behind" social construction are metaphysical claims doing political work. The oldest version of the "reality has a hidden mathematical order" thesis traces to [[Pythagoras]], whose equation of cosmos with ranked, harmonious order ([[Music of the Spheres]]) still underwrites claims that social hierarchy mirrors a hierarchy of being. The [[Traditionalism]] of [[René Guénon]] and [[Julius Evola]] is explicitly metaphysical: it posits a perennial, hierarchical order of being against which modern egalitarianism is read as metaphysical revolt. Anti-"social constructionism" arguments in the culture war are, at bottom, disputes about whether categories like sex or nation are metaphysically real or merely conventional. ## Relationship to other branches Metaphysics grounds [[Epistemology]] (what can be known depends on what there is) and shades into [[Political Philosophy]] wherever claims about human nature are load-bearing. See the [[Philosophy]] hub for the full map.