As far as I understand it (probably wide of the mark)
All physical objects in our universe have three dimensions of space and one of time; there is no freedom of movement in the temporal dimension,
but physical objects exist as a progression of events through this temporal dimension.
On top of that the three spatial dimensions are described as being curved by gravity, and sometimes are considered to be multiply connected into loops or hyperspheres and so on; this curvature doesn't happen in a spatial dimension but a nonphysical one apparently, but that is too weird even for me.
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