Good questions
- I think the universe is located dead centre, in the middle of nothing
. The universe, in my opinion, is our consciousness in physical form, and the nothing, is the part of our consciousness we haven't awakened or explored yet.
- Nothing, again, is our unexplored consciousness, and nothing is just something we haven't dicovered yet.
- When someone loses their sight, they use their other 4 senses along with imagination and "6th sense" to form an image in their minds. I guess you could say they replace their sight with a kind of psychic sight.
These answers are only my theories, but I hope I've provided some thought worthy answers for you