Via Above Top Secret: I'm watching the really good show on NatGeo called Genius about Einstein and he showed with Relativity that we live in a timeless universe and the evolution of any 3D experience isn't objective reality. He said: “Since there exists in this four dimensional structure [space-time] no longer any sections which represent ‘now’ objectively, the concepts of happening and becoming are indeed not completely suspended, but yet complicated. It appears therefore more natural to think of physical reality as a four dimensional existence, instead of, as hitherto, the evolution of a three dimensional existence”. From his book Relativity We're looking at Plato's Cave. He also said the distinction between past, present and future is just a persistent illusion. So in this context, we can't look at our universe as any sort of objective reality. It's subjective relative to four dimensional spacetime. There's all sorts of spacetimes different than ours that are outside of our light cone. They could be in curved spaces different than ours based on their reference frame. For 3 dimensional objects, we can experince different times and different space based on our acceleration. The things that are constant are the speed of light and spacetime intervals. So an object traveling close to the speed of light will will experience time ticking more slowly and their length will contract and it will get smaller. So time is connected to spacetime intervals between events. The faster you go towards C means spacetime interval ticks between events gets slower and more stretched out. Here's a couple of videos that talk about spacetime intervals. So this raises questions about things like free will which I believe is answered by quantum randomness and things like the free will theorem which speaks to the quantum nature of consciousness. So events can be seen in different order and in different ways by observers in different reference frames. Say you have observer A and observer B. Observer A sees these 3 events in order. JFK's election The Cuban Missle Crisis JFK's death in Dallas. Observer b can be moving in a different reference frame because they're accelerating at a different speed and are at a different angle relative to observer A. So observer B sees: JFK's election The Cuban Missle Crisis He doesn't observe JFK's death though. His past light cone just contains these 2 things and not JFK's death. The question becomes, does observer B have to observe JFK's death or can JFK assassination just become an assassination attempt? JFK then serves 2 terms and lives to be 85 in the future light cone of observer B. Einstein would say, observer B would have to see JFK's death. This is because he didn't think God played dice with the universe therefore he didn't like quantum randomness or things like entanglement. If he were here today, he would probably support parallel universes because quantum mechanics doesn't lock observer B into observer A's worldline. So just because observer A saw JFK's assassination it doesn't mean observer B has to see the same thing if JFK's assassination hasn't happened for observer B yet. Richard Feynman saw time in a similar way with sum over histories which indicates the direction of our ordinary clock time is simply a path in space which is more probable than other directions. Other worlds are just other directions in space, some less probable, some equally as probable as the one direction we experience. Sometimes our world represents the the path that's unlikely. Feynman's summing of all possible histories could be described as a timeless description of a multitude of spacetime worlds all existing together in a simultaneous way. Here's Feynman talking about the universe as a glass of wine (Plato's Cave).