Humans often perceive
cosmic space as being above their heads, pointing up when asked
where it is. Of course space is all around us, including straight
below our feet. Even if just a matter of custom, this pointing
up is traceable to an ancient human mindset that defines existence
by visibility; meaning, something exists where it can be seen
and doesn't exist where it can't.
Note the common phrase, "You have to see it to believe
it."
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