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So if there are length, height, and width, what else is there to fill, physically speaking?
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We don't have a word for it because it doesn't exist in our universe. A way to do it is to call length (left-1 and right-1), width (left-2 and right-2), depth (left-3 and right-3), so then you get (left-4 and right-4) as the 4th dimension.
More 4D pics:
There are 6 poly-4-topes (the equivalent of polyhedra):
Simplex: 5 vertices, 10 edges, 10 triangular faces, 5 tetrahedral "cells"(3D polyhedra)
Hypercube: 16 vertices, 32 edges, 24 square faces, 8 cubic cells
Cross Polytope: 8 vertices, 24 edges, 32 triangular faces, 16 tetrahedral cells
24 cell: 24 vertices, 96 edges, 96 triangular faces, 24 octahedral cells
120 cell: 600 vertices, 1200 edges, 720 pentagonal faces, 120 dodecahedral cells
600 cell: 120 vertices, 720 edges, 1200 triangular faces, 600 tetrahedral cells.
The last couple I got off a site, but I can actually visualise and draw the first 4.
Edit: I probably could draw the last 2 but can't be bothered.