I’ve heard about this idea a lot, but on the flip side it doesn’t seem to make sense. Us as 3D beings can’t naturally encounter 2D things, just representations of them (drawings etc), but nothing in the real world that has just 2 dimensions. So how could it be possible for there to be 4 (or more) dimensions?
In: 3
We don’t know if there are more than 3 spatial dimensions in this universe. From a physics standpoint, one of the major theoretical exploration is the idea that fundamental “particles” in our universe are built out of smaller bits. One way to make this explanation work (ie that it would result in something like our universe) is there are additional spatial dimensions (7 or 8 additional depending on theory)
The idea is that these are very, very small (much smaller than the smallest things like electrons) and sort of “rolled up”. So humans would not ever experience them directly.
Bear in mind, these are advanced theories and, so far, there is no way to verify the existence of these dimensions.
If there are other universes in existence (again no evidence to suggest this), there is also no reason to expect that 3 spatial dimensions is somehow “correct”.
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