Casimir Effect: Space Is Not Empty

A comprehensive theoretical analysis of the Casimir effect within the framework of Triadic Mesh Dynamics (TMD).The work demonstrates that the Casimir force is not a consequence of quantum vacuum fluctuations, but a macroscopic response of a sub‑Planckian orientational network of triads to geometric and material constraints.The document contrasts the traditional QFT interpretation with the mechanical TMD model, presents hydrodynamic analogies, discusses experimental dependencies on media, and proposes new experiments capable of distinguishing TMD predictions from classical theory.Includes formal appendices covering spectral limits, gradient constraints, historical corrections of the Casimir formula, and triadic predictions of Casimir spectra.