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I'd like to draw a distinction between non-physical and metaphysical. The opposite of a thing is not the same thing as the meta of that same thing. The meta attempts to unify the topic and it's reverse. Metaphysics wants to kill the distinction between physical reality and non-physical reality. Non-physical disciplines such as mathematics wants to distill the non-physical essence of things

This is a really nifty insight. Mathematical objects aren't physical, but that doesn't mean that there aren't objects that are neither physical nor mathematical. I wonder what those objects might be like!

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