Twix18 wrote:and since you cannot travle to or through it, it cannot exist.
I can't travel through the wall that I'm facing right now; does that mean it doesn't exist? Of course time exists! Otherwise, you wouldn't have been able to post that message!
To brasilerio: If you've been to a barber shop with mirrors on both sides of the room, you'll know that there's a far easier way to see the back of your head.