I have a couple of extras for you.
The Shelf Theory.
which pretty much suggests that exist outside of your visual, audible, and tactile range. EX: When you leave the house to pick up some milk, and you lock the door, how EXACTLY do you know the interrior of the house still exists, or when you drive down the road - all those people you see, all those cars, houses, and telephone poles - how do you know they'll be back when you return?
Its as if you put it on a shelf in the back your mind.
And the Holographic Paradigm.
Too complicated to explain, go here:
http://Http://homepage.ihug.co.nz/~sai/hologram.html