So, if in theory there is no edge, would it be possible to travel it and end up where you started?
As in, if you left London in a straight line you will end up back in London?
If this plane of existence is spherical perhaps. What if the 3D universe is merely a condition within a plane and not the plane itself?
That's kinda confusing...
Lemme splain...
In this plane we exist in 3 dimensions. We encounter 'things' in 3 dimensions.
But, also within this plane of existence, there are things we encounter that have no 3d structure. Energy, sound, dreams, desires, thoughts, that kinda stuff.
It occurs in this plane of existence along with the 3D stuff. We call all of this the Universe.
Being within, part of, the Universe makes you part of the Universe as well. It also makes all your dreams and thoughts part of the Universe. Moving within yourself (The Universe) is insignificant to location points. You never actually departed from or arrived into.
Take a bowl of water. Move one molecule of H2O from one side of the bowl to the other then back again. Only, never allow that molecule to leave the water in the bowl. The molecule is the same as all the other molecules, it has no distinctive difference and cannot detect a change in location. By its reference, it never moved.
Now, take that molecule out of the water and move it to the other side of the bowl. Its reference changes, it sees air molecules. Then it changes again and it sees water molecules. It knows there was a change but it returned to its starting point after the change. It has no idea it is on the other side of the bowl. It was surrounded by other water molecules and it is once again surrounded by other water molecules. Thus its back where it started.