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A model of reality in which the system is closed to outside influences—everything that happens is determined by initial conditions and internal dynamics, with no room for true novelty or external intervention. This is the reality of classical physics, of strict determinism, of the feeling that your life was over before it started. Closed system reality is comforting if you like certainty and terrifying if you like freedom. It's the reality of people who say "everything happens for a reason" (the reason being initial conditions plus deterministic laws) and of those who believe the future is already written.
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