Microcosm–macrocosm analogy

The microcosm–macrocosm analogy (or, equivalently, macrocosm–microcosm analogy) refers to a historical view that posited a structural similarity between the human being (the microcosm, i.e., the small order or the small universe) and the cosmos as a whole (the macrocosm, i.e., the great order or the great universe). Given this fundamental analogy, truths about the nature of the cosmos as a whole may be inferred from truths about human nature, and vice versa.

Source: Wikipedia — Microcosm–macrocosm analogy (CC BY-SA 4.0)