Once more: "Brevity is the soul of wit, but repetition is the heart of instruction." -- Gen. George S. Patton, Jr.
Also in his most famous book concerning time, 'A Brief History of Time', Stephen Hawking envisions life eternally migrating 'Middle Earth'-like through "life zones" of countless universes, themselves "many worlds" eternally migratory in the multiverse circles of REALTIME, end to end, beginning to beginning, beginning to end, end to beginning, observable past histories (hologram simulacrums), un-observably dark universe future histories observable to travelers passing relativity to relativity (concurrent SPACE to SPACE) only.
Thus there are two travelers splitting out from the one traveler, the observable simulacrum universe simulacrum traveler that observably travels past histories (slowing down in time) into the pasts of SPACETIME, and the dark objectively real universe objectively real traveler that un-observably travels future histories (remaining concurrent in concurrent REALTIME) into the futures of REALTIME. The reverse of the picture, the objectively real REALTIME traveler's oncoming travel to the observer (the REALTIME observer) causes the holographical simulacrum traveler to have to speed up, accelerate up, in SPACETIME to catch up to merge with the objectively real traveler at arrival to shake hands with the observer. A split out into an ever expanding triangulation of three point corners (two un-observable reals, one observable simulacrum), a pair of triangulations actually (one relative to observer / one relative to traveler) . . . then in return, an ever contracting triangulation of three corners of a triangle (two dark universe reals, one observable universe simulacrum; each triangulation).
Light and SPACETIME, no matter in the microcosm or in the macrocosm are a matter of countless always single facing single-sided 2-dimensional frames . . . a matter of photo- / photonic- framing. Their cosmic meeting crossings, crossroads, are always omni-faceted 0-point-enclosed Einsteinian 0-speed.
Which always leads the other in the race anywhere? The dark universe real or the observable universe simulacrum? Until the finish line, in oncoming. that is, when the simulacrum catches up finally from always being behind (a past history), the (was [yet-to-be-observed] future history) real.
And by the way, I guess I'll drop a bombshell . . . there is no real difference between "speed" and "distance" in the universe. As in the "distance" to the "speed" of light . . . "distance" to the Planck / Big Bang collapsed cosmological constant (/\) 'Horizon' set of an infinity of horizon universes (including this one), momentum and/or position, superposition, 0-point to 0-point.... Again, there is no real difference between "speed" and "distance" in the universe.
'Asymptote': A line that approaches a given curve but does not meet it at any finite! distance.
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"From a drop of water...."