It is just depicted that way. What you're touching upon here is one of the fundamentals of special relativity: there exists no absolute coordinate system, only coordinates relative to other things, so we might as well conveniently define the z axis by the earth's north pole
Edit: and as far as I remember the space of our universe is probably slightly positively curved, which might mean that you would end up where you started if you travelled in a straight line. I'm not certain though
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Originally Posted by Trollheart
You sound like Buffy after they dragged her back from Heaven.
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Originally Posted by WWWP
I want to open a school for MB's lost boys and teach them basic coping skills and build up their self esteem and strengthen their emotional intelligence and teach them about vegetables and institutionalized racism and sexism and then they'll all build a bronze statue of me in my honor and my bronzed titties will forever be groped by the grubby paws of you ****ing whiny pathetic white boys.
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