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This post features Section 3 of Dr. Hakeem Ali-Bocas Alexander’s “Axiom of Necessity,” which introduces the seminal thought experiment, “The Coin and the Paper.” Dr. Alexander employs this tool of pure reason to strip away the complexity of cosmological models and prove the necessity of an eternal reality. The coin represents any bounded physical system, while the circle around it symbolizes the perceptual boundary of our models. The paper is the necessary, unbounded context. The article meticulously explains why asserting that the circle contains all of existence is a logical fallacy—a category error that ignores the recursive nature of boundaries. Dr. Alexander draws two powerful conclusions from this experiment: spatial/temporal finitude is an illusion, and the substrate of existence must be uncreated and eternal. This section represents the crucial logical groundwork for the formal declaration of the Eternality Axiom.