I've written about another interpretation of 4D world, but it's actually 3D + Time (3 directions and time). But, now I'm working on the 4 driving forces scenario, and I'm interesting in Physics' 4D (which actually, it's 4 directions and [time(s)?]). So this post, we need to imagine the real 4D, not 3D+time like before.
from 1 Dimension to 5 Dimension
Computer simulation on 4D: Miegakure
M-Theory and String theory
Before the Big Bang
Understand 10 dimensional universe