Why Computation Works: Universal Constraint Parsing and the Structure of Reality

Does the universe run on computational principles because it is a simulation, or do computational systems succeed because they capture how reality actually works? We argue for the latter through Universal Constraint Parsing (UCP)—a framework showing that constraint-based selection operates throughout physical reality from quantum mechanics to consciousness. Computational systems work precisely because they can instantiate this natural mechanism, not because reality is itself computational. We examine the simulation hypothesis literature (Bostrom 2003; Chalmers 2005), analyze the relationship between UCP and computational models, and show why the deep effectiveness of computation in science reflects variational and constraint-selection structural matching rather than ontological identity. This undercuts the explanatory motivation for the simulation hypothesis by explaining computational success without requiring reality to be a computation. We conclude that UCP provides a more parsimonious explanation: computation succeeds when it mirrors constraint-parsing mechanisms already present in nature.