In this thread, I'm making what I think is a simple point. Some of your posts seem to more-or-less agree, but also present themselves as if they disagree.I don't understand what you're trying to say.
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I don't really care about the underlying rules of physics describing how things work. All I care about is what is experienced, what is perceived and how. Do atoms exist? It doesn't matter because the PCs will never see an atom.
My point is that I do not think that D&D worlds treat the physics of the real world as a default. That is, I don't think they assume universal gravitation (they do assume that unsupported bodies fall to earth; but I don't think they assume that the reason for this is also the reason for celestial motion); I don't think they assume relativity; I don't think they assume the atomic theory of matter; I don't think they assume the oxygen theory of combustion (especially given that air and fire are elements); etc.