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Imagining the Fourth Dimension A direct link to the above video is at Here's where we start getting into some possible confusion because the same word can have many different meanings. But the more we learn about "space-time" and general relativity, the more we realize that time is not just an arrow. This is why, with this project, I prefer to call the fourth dimension duration. Here's something important to remember: none of these dimensions exist in isolation. So. In "Aren't There Really 11 Dimensions?" Last entry, we talked about how it's really impossible for us to "see" the third dimension, because it takes a certain amount of time for the light from anything in the third dimension to reach our eye - and that's just as true for our hand in front of our face as it is for a star ten light years away. One word physicists use to describe the path an object takes within space-time is a world line. What's outside that largest possible 4D point we've just imagined?
Imagining the Tenth Dimension