4- dimensional space geometry, what is the point? I just read about the 4 dimensional space. I found a nice article describing how to visualize a 4-D object into our 3-D world. This is really fascinating.
However, what's the point of researching in this area? Is there any practical use of the 4-D space objects? 
 A: It certainly has the POTENTIAL to be useful. It is entirely possible, and partially theorized, that our universe is comprised of additional dimensions and we can only perceive three spatial and one time dimension. Some variants of string theory, such as M-Theory propose up to 11 spatial dimensions. 
If it is indeed the case that there are additional spatial dimensions, then it would be extremely 'useful' and 'practical' to research and visualize these fields. Another use of the research is to develop tests that may determine if we are existing in n-dimensional space or not, and if we are, how (if at all) we could interact with them.
If you haven't seen/read Flatland, the plot consists of hypothetical beings living in lesser dimensions.
You can watch one of the movies based on the book: http://flatlandthemovie.com/
A: This is an interesting article however it fails to take into account our ability to perceive the depth  of something which is obviously quite a big factor , the 4th dimension is just something created to try and explain the universe or explain why we cant explain the universe, there is no real reason for creating another dimension that has no effect on our 3d universe at all except than to feed the imagination. This is my opinion and everyone is entitled to there own, this is just mine. http://en.wikipedia.org/wiki/Depth_perception
