If the people of Flatland didn't know they lived in a flat land, would we know if our Universe is flat?

If the people of Flatland didn't know they lived in a flat land, would we know if our Universe is flat?
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Answer :

answer:We wouldn’t. I always thought that was the point of the book. But why would our universe specifically be flat as a result of the multiverse? I only watched the first minute or so of the video – do they get into this later on? At any rate, I don’t think the concept of “flat” is applicable in the real world. Everything has dimension. Points and lines are useful ideas, but not physical objects.
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