"Actually, all possible universes could exist in the 4th dimension." Wick yawned. "Whether there is a 5th is beyond my ken, if you know what I mean. Its hard enought to consider a 4 dimensions, let alone a 5. Here is how you can think of a 4-space filled with all possible universes.
You know there are stars, and planets almost without end, it would seem, travelling about in their own sphere's in the known universe. Try to imagine the universe as a planet. Instead of a surface, like earth has, with seas and continents, mountains and rivers, deserts and steppes, our universe has a surface of space and everything space contains. Every point in this universal planet is exposed as a surface to the view of a greater space through which the universal planet moves.
Our universal planet orbits another body, which is also a universe--probably very different from ours--something akin to our sun. This universal sun has a 3-dimensional surface of hot plasma very much like the imagined beginnings of our universe after the big bang. It is also the anchor of a number of other universes of various natures and sizes--as planets always are. In the far distance are other stellar universes, which are clustered together like our into a galaxy, and far beyond the borders of the universal galaxy are other universal galaxies, worlds without end.
It like that old song "There's a Hole in the Bottom of the Sea", only we start with electrons and quarks, which rise up into atoms, molecules, elements, substrates, planets, star systems, star clusters, galaxies, galactic clusters, a universal planet, a universal system, universal galaxies, universal galactic clusters.
But our mathematics becomes less elegant in the fifth and higher dimensions. I suspect that this tells us something about nature. Perhaps the fourth is highest, but who's to saY?


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