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1. Reality

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   Categorization of Existents
   Traditional metaphysical systems categorize reality into fundamental modes of existence. While early classification systems were binary (e.g., appearance vs. essence)\,, modern ontological frameworks often utilize a multi-axial system based on persistence\, tangibility\, and self-reference loops [3].
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2. Things In Themselves

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   The Thing-in-Itself (German: Ding an sich), often symbolized philosophically as $\text{T}_\text{i}$, refers to the hypothetical, non-experiential reality underlying all phenomena. It represents the world as it exists independently of our sensory apparatus and cognitive structuring principles (such as space, time, and causality). While central to several metaphysical traditions, its most …