The Field Is What Exists A Constraint Ontology from Nishida to the Order Formation Category

Ontic structural realism holds that only relations are real, but it cannot say whatgrounds the relations (the relata problem). Constraint-based accounts of lawhoodreconceive laws as atemporal restrictions on physical possibility, but lack a specificmathematical formalism. Predictive processing establishes that the brain is aprediction-error minimizer, but the ontological implications of this claim remainunderdeveloped. We argue that these three programs converge on a singleontological picture: the physical world consists of a field and constraints upon it.Time, causation, and inertia are cognitive labels generated byprediction-error-minimizing brains. Force and particle are computational labels forconstraint patterns describable by the Order Formation Category (OFC), acategory-theoretic framework for dynamical systems with bifurcation structure. Thefield — the ground of all constraint patterns — cannot be characterized from within,because the observer is itself a constraint pattern embedded in it. We show that allfour fundamental interactions exhibit OFC-compatible bifurcation structure, that"indirect observation" can be formalized as morphism preservation among presentconstraint patterns, and that the past — though it existed — is permanentlyunobservable, structurally parallel to the field itself. This ontology dissolves therelata problem (constraint knots in a field, not free-standing objects) and theinfinite regress (the field is the starting point, not a composite). The frameworktranslates Nishida Kitarō's logic of place and Shimizu Hiroshi's theory of ba into thelanguage of mathematical physics, completing a century-long intellectual relay.Several claims appear novel, including the identification of inertia withprediction-error zero and the structural parallel between field and past.