Imagining the Tenth Dimension. Imagining the Tenth Dimension - 2012 Version. Imagining the "Zeroth" Dimension. Imagining the First Dimension. Imagining the Fourth Dimension. Extra Dimensions - PHD Animation. Imagining the Tenth Dimension. 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. When people say that "time" is the fourth dimension, what does that mean? The fourth dimension adds a way for the third dimension to change: this is obvious when we say "the third dimension is space without time". 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? " Likewise, persons who talk about tesseracts as being four-dimensional objects say that this is what the real fourth dimension is like, but what we're really talking about with a tesseract or any other n-dimensional shape is the same as a cube: it's an idea.