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It's a (mathematically) multidimensional thing; if things can "move" there are clearly dimensions those things can be spread across.

There are lots of things we can't know, but it's like toothpaste; if we posit certain things as fixed, if our observations mean anything, something else has to vary.

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> There are lots of things we can't know, but it's like toothpaste; if we posit certain things as fixed, if our observations mean anything, something else has to vary.

...how is that like toothpaste?

I don't disagree with what you're saying, but... toothpaste?

Seconded. Your analogy is like a banana tree; no matter how many things vary, a horse is not an elephant.

I have no idea, but maybe... by keeping the tube fixed, we know that it must be the toothpaste which will move?

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