The Perceptual Vibrational Framework (PVF) proposes that physical reality is underpinned by a single continuous vacuum substrate characterized by stiffness, inertia, and finite accessibility, rather than by fundamentally discrete particles or fields. Within this framework, quantization, particle identity, force separation, and thermodynamic irreversibility arise as emergent consequences of mode structure and observational thresholds. We formulate the dynamics of the vacuum using a single real scalar field and show how localized (standing) and delocalized (traveling) modes correspond to bound states, transport, and radiation. The conventional band gap, work function, and transport thresholds in electronic systems are reinterpreted as accessibility limits set by local vacuum stiffness. Entropy growth is linked to the monotonic relaxation of stiffness, providing a geometric origin for the arrow of time. The speed of light emerges as the characteristic propagation speed of massless disturbances in the vacuum and is shown to be a structural limit determined by stiffness and inertia, with possible cosmological evolution. Observable phenomena ranging from semiconductor transport and ignition thresholds to cosmological expansion are unified under a common mechanical description. While the framework does not replace established quantum or relativistic formalisms, it provides a coherent interpretive layer that explains why discreteness, probability, and limits arise universally from an underlying continuous substrate.