Ankh
In my theory above I stated that the vertex of the intersection not only represented our universe but also the human being. I also said that the doppelgangers (future selves) of the human were constantly checking the future and avoiding all dangerous obstacles by going back in time and changing the future course of the human. When the doppelgangers move away from the human being and into the future they are actually moving out and away from the vertex (human). When the doppelgangers see that danger is ahead they turn around and head back towards the vertex to change future events right in front of the vertex.
I also said that if this event had a physical appearance it would look much like an ancient Egyptian Ankh. Like this:
Notice how the oval on the Ankh looks like a U-turn, and ends up back in the same place from which it came......in the vertex.
Well, according to the description from the link above, the ancient Egyptian Ankh represents eternal life. Which is what my theory suggests. But I wrote my theory before I knew what the Ankh meant. Also, in the link, they say that the ancient egyptians made mirrors in the form of Ankhs and believed that life and death were reflections of each other. This is exactly what I was saying in my theory.
I believe that ancient symbols have alot of meaning. I dont, however, believe in the popular notion that ancient people were superstitious fools.