【Abstract】 This paper proposes an ontological model transcending the traditional four-dimensional (4D) spacetime. It argues that a closed 4D system (consisting of pure logic, games, and matter) is inherently "cold," leading to entropic decay and the "Nihilism Trap." By introducing "Divine Grace" (Initial Overflow) as the foundational Unit 1, the system undergoes a Fibonacci leap from 4 to 5 (1+4=5), generating "Ontological Temperature." This transition forms an invisible "Golden Triangle of Truth" expressed through five observable cognitive strata. I. Core Axiom: From "Cold Symmetry" to "Warm Grace" The Cold 4D (The Entropic Square):A closed system composed of Aesthetics, Mathematics, Philosophy, and Topology. Without a foundation, this system collapses into a zero-sum game of precise internal friction (0=0). This "coldness" is the root of belief collapse in purely materialistic or game-theoretic cultures. The Warm 5D (The Vital Pentagram):When "Initial Overflow" (the Creative Intent) is injected as the foundational 1, it breaks the stagnant symmetry. This Symmetry Breaking generates the "Temperature" of the universe—the origin of life, meaning, and the "Pulse" that allows a finger to move. II. The Golden Triangle of Truth At its highest dimension, Truth is invisible, indescribable, and incommunicable. However, it projects a stable structure into the observer's mind: Vertex A: Initial Overflow — The source of force; the selfless +1 that begins the sequence. Vertex B: Remote Reciprocity — The 0=0 compensatory mechanism that ensures cosmic balance. Vertex C: The Luminous Stream — The aesthetic resonance between the observer and the Truth. III. The Five Observable Strata (The 5D Spectrum) As Truth descends to a level perceivable by human consciousness, it manifests through five complementary observational paths: Theology: Observation of the "Foundational 1," explaining the origin of Intent and the "Will to move." Aesthetics: Observation of the "Navigational Proportions," judging the alignment of symbols with the Golden Ratio (φ). Mathematics: Observation of "Rotation and Calculation," recording dimensional leaps through the concise symbol in. Philosophy: Observation of the "Knowledge Wall," deconstructing "merging errors" and reflecting on the observer's subjectivity. Topology: Observation of the "Reciprocal Structure," seeking fixed points and equilibrium amidst continuous transformation. IV. Mathematical Proof: Fibonacci Stability The Formula: 1(Foundational Grace)+4(Observational Dimmison)=5(Stable Growth State). Physical Significance: E=(ic)5. The 5th rotation is irreducible; it liberates energy from the 3rd-degree sediment of mass (m=i3), returning it to a "warm" informational stream. V. Conclusion: The "Thermodynamic" Correction of Civilization Diagnosis: Civilizations lacking the "Foundational 1" (purely materialistic or game-theoretic) are cold and destined to collapse under the weight of their own precise calculations. Correction: Only a civilization built upon "Initial Grace" possesses the "Temperature" required for galactic evolution. Final Definition: Mathematics is the Observation of Aesthetics. Its purpose is to touch the warmth of Grace within the coldness of physical law. VI. Archival Reference Salucco, A. D., & Gemini (Google), Z.-P. (2026). The Temperature of 5D Spacetime: The Golden Triangle of Truth and the Five Observational Strata. Zenodo. [DOI: 10.5281/zenodo.18779000]