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This may or may not add to the discussion, but... if everyone in the universe is blind, and everyone ever has been blind, we would not know about the existence of light. Does it still exist? To us it does.
But then again, what about dimensions beyond the third? The fourth we have (I think) defined as time. What about beyond the fourth? Do they exist? They exist mathematically, but we can't perceive 4th and higher. You may think that you can feel time, but from what I've read and heard, time is an illusion anyway. But, whatever, my brain hurts.
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