The RGB Axes as Spatiotemporal Coordinates: Hemispheric Lateralization, Subjective Time, and the Generative Structure of Observable Dimensions

The trichromatic structure of human colour vision is conventionally understood as a sensory adaptation for discriminating surface reflectances. I propose that the R, G, B axes are not merely chromatic coordinates but spatiotemporal coordinates: R encodes spatial distance (the contractive, measuring axis of the left hemisphere), B encodes temporal flow (the expansive, directional axis of the right hemisphere), and G encodes the gravitational-integrative centre. This identification is established through a formal theorem derived from the Z/3Z principal bundle structure: given the closure condition 1+ω+ω²=0 and the involutive property X²=−Id, the three axes are necessary and uniquely determined as contractive (R), neutral (G), and expansive (B). The theorem is not an analogy — it is a derivation from the algebraic properties of the bundle. The proposal is grounded in five empirical convergences: (1) hemispheric lateralization of spatial processing (left/R) and emotional-temporal processing (right/B); (2) duration selectivity in right parietal cortex reflecting subjective time experience (Hayashi and Ivry 2020); (3) right anterior insula as substrate of interoceptive awareness and temporal flow, recently confirmed through interoceptive stimulation (Kipping et al. 2024); (4) suppression of temporal experience during slow-wave sleep, consistent with return to the neutral G state; and (5) structural convergence with relational approaches to spatiotemporal emergence. Three verifiable predictions with specific quantitative constraints are formulated.