Is there a clear way to distinguish physical and non physical things? I'm not

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Is there a clear way to distinguish physical and non physical things? I'm not implying that there are non physical things. I would prefer if you didn't define "physical" as whatever is studied by physicists.

How about this: All physical things occupy spacetime. But not all nonphysical things occupy spacetime, and maybe none do.

The clearest example of allegedly nonphysical things would, I think, be abstract objects such as numbers and sets. Platonists say that there are infinitely many such things. See this SEP entry.

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