Though our space is only a substance we can feel in a certain manner, there are other worlds and other creatures that we cannot feel, though they exists in the same dimension we do. The term “dimension,” in our limited understanding, demonstrates how incapable we are of feeling what our sensory organs are not meant to understand.
In fact, even the word, “dimension,” is meaningless. In a different sensation the dimension also becomes something completely different.
For example, try to imagine what we would see instead of the ordinary universe if we could see with X-ray eyes. This demonstrates what a drastic change a single alteration in our senses can produce on our picture of the world.
http://www.youtube.com/watch?v=6ajsXzTFLYA