see, this is where i think philosophy can come in and help, like you for instance....
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The trouble is that our theories have now transcended our comprehension. For example, it is utterly impossible for a human being to visualise four dimensional spacetime, but we know it exists because of observations made on the speed of light...
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well, if the reasoning is there, if the logic is there, and it's independent from us (in the sense of empirical observations....more or less) then it can be, it can exist.....
i mean, you don't have to go as far as "four dimensional space".....you can easily take "gravity" for example....we can't see, although we claim we can "feel it" (empirically.....for in space, gravity is virtually non-existent), but it's true proof lies within its relationship to other things.....like us, the fact that we're "stuck" here.......
we can comprehend this.....just like we can comprehend things outside our empirical observations.....like four dimensional space, unicorns, God for that matter.....
there's a whole crap loud of philosophical justifications to prove such theories, that suggest (with logical justification) that there exist things not external, not material, not physical, yet can still be "comprehended"......
but, i guess it truly does boil down to one's perception......does the metaphysical exist? most philosophers agree, all religions agree (whether they know it or not), and even a handful of scientists agree..........