You often hear theories about parallel dimensions or parallel universes, but I ask you why do they have to be parallel? Dictionary.com defines parallel as: extending in the same direction, equidistant at all points, and never converging or diverging.
But why must these other dimensions or universes never converge? Why must they always be equal distance apart? I have heard a theory that says that ghosts and aliens are just beings from other dimensions that manage to travel to or effect this universe in some unknown way.
Anyway I have spent some time trying to figure out what a perpendicular universe would be like as opposed to a parallel one. A parallel universe would be easy, it would be almost exactly like this one. A perpendicular universe would be at right angles to this universe. What would that mean?
Or what of a tangent universe, where it touches our universe at only one spot. If Einstein was right about space-time, does that mean a tangent universe only touches one spot of space-time and therefore is identical to our universe, in that one spot at least, for just an instance, or is that one spot the same in both universes throughout all eternity?
If you were standing in a spot where two or more universes converged would you be able to tell the difference? Would you suddenly have the knowledge and memories of your other selves, assuming you had other selves in those universes.
In a parallel universe its relatively safe to assume that there would be a parallel you living a parallel life. But what of a tangent universe? Would there be a tangent you that only resembled you for that one instance?