How Two Massless Things Can Create Mass

Natural Evolution of Actuality (NEA) begins with two independent, abstract parental lawful responsibilities and the primitive consequential joining responsibility. Its developed null-spinor construction already shows that two rank-one Hermitian carriers, each with a zero Lorentzian determinant, can yield a positive timelike invariant when lawfully joined. We reconstruct that source-owned result without identifying the primitive parents with photons or presupposing physical mass at the pre-metric level. We establish the exact determinant, exterior-product, Lorentz-covariance, and Bloch-sphere relationships, and then sharpen their physical meaning. For two selected positive-energy null momenta in natural units, the squared composite mass invariant equals twice the product of their energies multiplied by one minus the cosine of the angle between them. This invariant is strictly positive for nonparallel directions, whereas parallel joining remains null. New conditional results include a multi-carrier Cauchy–Binet theorem equating the determinant of the summed outer products to the sum of squared pairwise wedge-product magnitudes, sharp energy and angular bounds, a future-sufficiency obstruction to erasing relative projective direction, and a selected stable-response witness exhibiting local positive stiffness without pretending to derive a bound particle. We show why the composite invariant is distinct from physical binding, from the 720-degree complete fermion, and from the collective Higgs/Yukawa and bosonic Gram mass mechanisms already developed in NEA. Lorentzian interpretation, dimensional calibration, conservation, interaction, and realized persistence require explicitly admitted physical maps. These exact mathematical witnesses deepen NEA’s theory of physical realization and actualization, though they do not entail that a unique microscopic selector, observed particle identity, or numerical mass is forced by the primitive framework.