“Space-time is a plane of existence by which humans exist and abide.  It appears to be an endless ocean of time and space, governed by gravity.  Humans experience time in this linear way, confined by our limited intelligence and capacity.  However, what if, like the Earth, the plane of space-time was actually round and cyclical?  What if black holes were thus just vortexes which transcended traveling through space-time altogether, in essence allowing for time-travel?  Cosmic Subways, if you will.  Enter one and emerge from any others, anywhere in the Universe.”