: The real fourth dimension is not time, as many people think and say it is...

: 0th dimension is a point...

: 1st dimension is a line...

: 2nd dimension is a plane...

: 3rd dimension is space...

: 4th dimension is... HYPERSPACE.

: You also can follow this way : : A line (1st dimension) is an infinite stack of infinitely little points (0-dimensions), : existing side by side, and each point has nothing common with any other. : A plane (2nd dimension) is an infinite stack of infinitely thin lines (1st dimensions), : existing side by side, and each line is also unique, and has nothing common with any : other line. : A 3-dimensional space is a infinite stack of planes, like a book, but with pages who are infinitely thin. : No page has anything common with another. If you can not move in the 3th dimension, you can never leave : your current page. : If we continue for the 4th dimension in the same way, we can consider that it is a : "hyperspace", an infinite stack of 3-dimensional spaces which exists simultaneously, but where no space : has anything common with any other space. To look into a "neighbour-space", you have to jump : through the 4th dimension.