Well have you developed a theory where non-existence is your starting point ?
The point that I was attempting to make is that zero or nothingingness is indeed nonexistent, yet we utilize all the time.
Zero provides the basis of equivalence 1+1=2, 2-(1+1) = 0
Zero grants the equal sign validity.
The human body utilizes it's center of gravity constantly... [ask any walker, runner, sitter, sleeper, gymnast etc...]
Would you deny this point?
The center of Gravity [mass] of all objects of mass must be absolute zero dimension.
Draw your own conclusions from that..
So indeed, I have started from non-existence yet existent and worked outwards to 4 dimensions.