Basically the opposite of reductionism.
Figure "xkcd 435: Fields arranged by purity" must again be cited.
Emergence refers to the phenomenon where complex systems and patterns arise out of relatively simple rules or interactions among components. It is often discussed in various fields, including philosophy, science, mathematics, and systems theory. In an emergent system, the collective behaviors or properties of the system cannot be easily predicted or understood by simply analyzing its individual parts. Instead, these properties arise from the interactions and relationships between the parts.
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