Quantum mechanics is not the fundamental theory of reality. It is the shadow of classical 600-cell geometry projected through the Galois boundary. Above the self-referential threshold, the geometry is classical — particles have definite positions and momenta. Below the threshold, only the projection is accessible — and projections of classical geometry look like quantum mechanics. The superposition principle arises from the linearity of projection. Entanglement arises from correlations in the underlying geometry that survive projection. The measurement problem dissolves: there is no collapse, only the threshold between regimes.