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The principle that the patterns and structures of the very large (macrocosm) are reflected in the very small (microcosm), and vice versa. It's the scientific echo of "as above, so below." An atom with a nucleus and orbiting electrons structurally resembles a solar system with a star and orbiting planets. The neural networks in your brain resemble the web of galaxies in the universe. This concept suggests that the universe is a self-similar, holographic system where the laws of physics create repeating patterns at every scale, from the quantum foam to the cosmic web. Understanding the microcosm (like quantum mechanics) often gives you the keys to understanding the macrocosm (like the behavior of black holes).
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