Physical system

A physical system is a system that is comprised of matter and energy. In this context, a "system" is taken to mean "an interelated, interworking set of objects that operates autonomously".

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For example, a lake is a physical system, and a written story about a lake is a conceptual system. In order for the conceptual system to operate, the physical system (human reader) has to "run" it, but the physical system runs on its own.

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