Yes, I am the 4th dimension.
kthx.
Okay, seriously... there is an easier way to explain 4 dimensions. Simply envision what happens when you move a 3 dimensional cube at a right angle to the x,y and z axes. Confusing, eh?
Think about the images you see of Hypercubes, Moebius strips, Klein bottles, Steiner's Roman surface... etc. The issue with humans is that since we ourselves are three dimensional and we exist in a 3 dimensional world we cannt actually visualise a fourth dimensino, it's beyond our capabilities. So, you might say "we can physically experience time" - however, can you? If you knew for certain that time was the fourth dimension you would be able to point and say "look, time is that way". What we can actually do is experience the effect(s) of time.
Let us assume that time is the 4th dimension, since we are confined to a lesser dimension, we cannot feel or see anything more than a projection of time. It is essentially equivalent to "flat land" falling through the 3rd dimension. Our understanding of time is limited at best and outright pathetic at worst.
The only way to construct such higher dimensions is via very complicated mathematical crap. Good luck in understanding any of it.
God and this stuff is a whole other discussion by the way.
M.
