What do you feel this is a metaphor for?
Notice how he is like a baby. Notice how their money is more valuable in the smaller world as there are more resources. That world is a complete reset where it’s as if they can “start over” and avoid the problems in this world. However, are they really going to change? There is fear before they make the transition as well, fear before the ‘big shift’. What are they afraid of? Losing their humanity? Never being in the same world they were born in again? Leaving behind their old worries? There are many angles here and they are all expanding towards fundamental change while also walking the line between total liberation and complete helplessness. Note, the military would likely have to secure these areas so that ‘big’ people didn’t get crazy ideas and come stomp all over their houses. Maybe there is something that will go wrong later in the movie? Maybe they will regret the change, and miss those who didn’t come with them or some part of the process will become unstable.
One can also see how the materialistic direction that this was taken can act as a kind of inverse metaphor for how the truth is the opposite, an immaterial shift that occurs within, individually. There are always double-ended metaphors that are like pathways leading to two different outcomes each carrying a message about reality and the self.
Higher dimensionality is apparently equivalent of larger. This is a bit confusing because this might not necessary indicate a larger ‘physical form’ but that the range of the energetic spectrum is larger which translates to a different form in this plane.
There are multiple explanations. The more direct explanations are now coming to the public. Research ALICE. Changes were made to the species in order to prepare. There are other explanations of genetic modifications and experimentation. And there are others of the higher dimensional metaphor for a more advanced civilization. They are all compressed into one ‘story’ with modern day interpretations that ignore the differences in the possibilities.