Summary: I model “ether” as the electromagnetic environment formed by the non-cancellation of electrons’ and positrons’ fields—a real, material background rather than an ideal vacuum. Within this discrete, non-vacuum picture, the constancy of ccc is a stable property of this environment; gravity emerges as a residual/gradient effect of electromagnetic fields. I outline consequences for photon propagation (path-dependent redshift/phase), lensing-like phenomena, and local “vacuum” structure, and sketch AI-based discrete simulations. The package includes the preprint and optional figures/notes. This work complements my papers on asymmetric slits, hyperbolic interference, and photon “birth time,” providing a unified discrete perspective without invoking continuous idealizations or the word “theory.”