ONE AXIOM 000: THE SOURCE – Pre-Ontological Foundations of the Primordial Quartet Description: This document, titled "000: THE SOURCE," serves as the foundational formalization within the "ONE AXIOM" framework. It investigates the pre-ontological layer—the structural stratum where the Void (●) and the Fano plane P^2(F_2) exist in a mutual definitional relationship. Drawing inspiration from George Spencer-Brown’s "Laws of Form", the author proposes that the fundamental axiom is not an object, but the relation itself: ● ↔ P^2(F_2). The paper rigorously derives the emergence of the "Primordial Quartet" {0, ♡, 𝔉, 1} and explores how this initial relation projects dually onto two order-8 structures: the cyclic group Z_8 (representing algebraic compression) and the Boolean group Z_2^3 (representing coalgebraic unfolding). Key mathematical and conceptual contributions include: The L-Adjunction: A restricted adjunction between the dual branches of bifurcation, capturing the primordial symmetry between sequential and spatial structures. The Perception Operator P(X): A formal mechanism that realizes Leibniz’s insight on perception as "the representation of the many in the one" by composing distinct perspectives into a unified tuple. Emergence of Coherence (♡) and Freedom (𝔉): Formal proofs regarding the stabilization of information, where Coherence (♡) acts as a measure of structural integrity and Freedom (𝔉) emerges from the availability of choice in the Boolean Z_2^3 structure. The Ordinant (𝔒): The derivation of the mechanism by which order emerges from cyclicity. State Space Stabilization: An analysis of why the system stabilizes at 64 elements (8×8) and the role of the S_4 group in coherence feedback loops. The document establishes the "pre-ontological skeleton" required for subsequent developments in physics, mathematics, and cognitive science within the Ultimate Horizontal Consensus model.