> I'm genuinely curious how you would think of three dimensional objects without ever being able to see them... [...] > without reference to anything you can see with your eyes, how would you describe space?

But the thing is: I wouldn't have to. People without sight live in space too. What mental models of the universe anyone has inside their head may vary wildly, but at the end of the day a torus is still torus-shaped when the lights are out, and West is to your right when you turn North while upside down.