New Perspectives: Imagining a 4D World
Regardless of your scientific background (or lack thereof), the 4th dimension is very a difficult concept to grasp. To understand just how difficult it is to envision a world with a 4th spacial dimension, let's use a couple comparisons. First, imagine a color that doesn't currently exist. Next, try to come up with a way to explain how an everyday color looks (like blue, for example) to someone who can't see. Both of those things are pretty difficult, right? Well, we run into exactly the same problems when we try to imagine a 4th dimension to space. Even for those of us with the most powerful visual imaginations, trying to picture how a 4 dimensional object would look in a 3 dimensional world is impossible. Truly and utterly impossible.
However, math offers us a little assistance in this area: http://ow.ly/wAI32
Image Credit: LearnSomething