Fact from fiction, truth from diction. Anything is plausible if you believe the theory. What do we really know as humans? If the scientist are correct with how long life has been on this planet, it would be like a newborn next to an old growth redwood at least. All of what science has achieved to date in reality could be compared to one-half bar of music in Beethoven’s 5th. What seem impossible, or ridiculous might be commonplace; if man last that long. The only reason it seem farfetched now is that we don’t have the means to know it is true. If I were able to go back to the time of Caesar with the technology at my disposal today, and had a way to make it work, I would be a god. The means and materials to make plastic was there in Caesar’s time, same with electricity, microwaves, radio waves, etc, they just didn’t have the expertise or means to discover it and use it. Oil was there, even the means to make an A-bomb. Dimensional travel might be something man can harness in the future, it could be our electricity as today electricity was to Caesar.
Dimensions on top of dimensions, or even imbedded in dimensions could be plausible, and even happening as we speak, and we don’t know it because we have no way to detect it; yet…..