Relativity as Orientation Transport in a Pressure-Wall Cosmology: The Time-Axis and the Metric

This paper develops a mathematical bridge between Tilt Theory, Special Relativity, General Relativity, and the pressure-wall cosmology introduced in papers R190 through R192. The central proposal is that the time-axis of a massive particle can be identified with its normalized four-velocity, T^μ = u^μ/c. Ordinary velocity is then the observer-dependent spatial projection of this future-directed axis, while proper time is measured along the particle's own axis. Four-momentum is interpreted as the inertial loading of the same axis, p^μ = mcT^μ, so that relativistic energy and momentum become temporal and spatial projections of a mass-loaded future direction. Inertia is interpreted as resistance to reorientation of the time-axis, and geodesic motion is interpreted as torque-free orientation transport through curved geometry. Within the pressure-wall model, the metric of General Relativity is treated as the effective common-mode curvature of a thin four-dimensional vacuum wall-pair, while global cosmic expansion is attributed to four-dimensional pressure imbalance, boundary reaction, and vacuum inertia. The paper does not replace the tested equations of SR or GR; rather, it proposes a physical interpretation in which relativistic geometry is the measured projection language of rotor matter carrying its time-axis through a curved, pressure-supported four-dimensional vacuum.