ialsoagree t1_iyd0byk wrote
Reply to comment by nhabz in ELI5: How is that space is “flat” yet we are able to look around the universe (up, down, left, right, etc.,) as if it were not flat? by nhabz
No no, we call it flat - but flat doesn't mean 2D.
We call paper flat, but paper isn't 2D, it's 3D.
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