There is a threshold in the self-referential hierarchy where abstract mathematical structure becomes physical matter. This paper locates that threshold precisely: it is the self-referential boundary at φ⁻¹, where the self-referential loop first closes and a definite eigenvalue becomes the only stable state. Below the threshold: pure wave structure, no definite mass, quantum superposition. At the threshold: the moment of freezing, when coherence pays the mass cost of self-reference. Above the threshold: classical matter with definite position and momentum. The edge of everything is φ⁻¹.