Is the 4th dimension just a concept on how the mind perceives time?
How could you physically navigate that?
Sure space-time is different than time on Earth b/c Earth is bound by a linear timeline.. Night & Day 365/yr 24/7 in rotation around the sun but wouldn't spacetime still be bound by the same concept of linear time even when not on earth b/c the individual still ages physically or mentally redardless of tracking the time in space or on Earth?
(Example)
In the movie "Interstellar" the time elapsed from Cooper when he leaves Earth to go into a blackhole & when he returns to Earth. Time (linear) is said to have elapsed by 76yrs (told to him by his Bot buddy Tars) from what he knew but in the movie he doesn't return to earth he returns to the new system developed to sustain life on a ship off Earth.
Cooper not having aged physically the ability for his mind to perceive this change so easily is not that easy.. Would this not wear your mind? I say this b/c after he visits his daughter (who has aged to an old woman) he preceeded to take a ship & go off into space unable to comprehend the massive change in (linear time) so he returns to (nonlinear time).