Canon, in media studies, is the set of facts, events, and relationships accepted as authoritative within a fictional world. It establishes what “actually happened” in the world and what can be relied upon as true across different works, tellings, or media set in that world.
The concept becomes significant wherever a fictional world extends beyond a single work. A novel series, a franchise, a shared-universe game setting, or a collaboratively built paracosm must each negotiate what counts as established fact and what does not. Canon is the conventional answer to this negotiation: it designates some subset of the total material as binding.
Canon operates in tension with continuity. Continuity is the internal consistency of a world across its realizations; canon is the social and editorial mechanism by which that consistency is maintained or enforced. A work may be internally consistent but non-canonical (fan fiction, alternate timelines), and canonical material may contain continuity errors.
In the Reproducible Paracosm framework, canon corresponds to the normalization functor : the terminating, confluent rewrite system that ensures all state updates converge to unique normal forms. Canon is what remains after the world’s rewrite rules have resolved. The framework’s gluing condition captures a related but distinct property: the ability of locally coherent fragments to compose into a globally coherent whole, regardless of which fragment is designated canonical.