The Categories That Change Us: Ontological Versioning, Epistemic Repair, and the Ethics of Classification under Fluctuation

Classification is often imagined as a neutral response to a pre-existing world. Yet a classification can also redistribute resources, authorize interventions, structure self-understanding, and thereby alter what it purports to describe. This review examines that reciprocal problem through Ontological Instability and the linked programmes of Fluctuational Metaphysics, Fluctuational Epistemology, and Fluctuational Ethics. Distinct from a general synthesis of these philosophies, the paper asks how categories remain usable when their referents, evidential grounds, and consequences can change together. Using a critical integrative review of Kwan Hong Tan’s repository theses and established scholarship on social kinds, classificatory infrastructures, epistemic injustice, and institutional design, it develops a three-register account of referent, representation, and intervention. The review introduces four provisional concepts: category lag, ontological versioning, reflexive classification injury, and normative carryover. It then proposes a six-stage versioning protocol that preserves historical traceability, contestability, protection, and repair during categorical revision. The contribution is not a metaphysical proof or a validated governance instrument. It is a cross-disciplinary analytical framework designed to distinguish genuine referent transformation from changes in measurement, language, or organizational incentives. A series of rival-explanation tests, boundary cases, and comparative research designs specify what would count against its usefulness. The central conclusion is that categories require neither permanent essences nor unrestricted malleability. They require accountable continuity of reasons and obligations while the things they organize remain open to transformation.