14.1.3 Massless patterns (e.g., photon): Possess minimal C (potentially C = 0). They are not complex, self-sustaining structures but represent the pure act of relational propagation (an IR being executed), essentially pure relation (R) without enduring distinction (D) structure. Lacking structural inertia, they propagate at the maximum speed of relational propagation (c), which is the fundamental speed limit of the emergent spacetime network, determined by the propagation rules and influenced by the proto-properties of the R's in S₀. Photon emission externalizes excess relational activity (ΔC/ΔE) from a pattern transitioning to a lower C state as a transient, propagating pattern (pphoton) with properties defined by ΔE = hf. The photon is the quantum of relational propagation itself, a packet of pure relational change, a directed relational link made manifest. It is the 'message' being sent across the network, not a node within it, a pure verb without a complex noun structure. Its existence is purely defined by its role in mediating a relational change between other patterns. It is a quantum of relational influence moving through the network, its properties (f, direction) determined by the change in the source pattern's internal state and the propagation rules, constrained by proto-properties.