Okay here's another mind-bender. We now know that the universe isn't just 3-dimensional, but that it's 3 dimensions plus time, or duration. For sake of simplicity, we call time the 4th dimension, but how can we do that if time isn't spacial like length width and depth? Well, in actuality, time is still a direction (just like length is left or right, width is forwards or backwards, depth is up or down; time runs in two directions as well.) and this means we can apply it as a dimension. So why can't we see it? We can't see it because we experience it one "time frame" at a time. Much like a camera records footage at a certain fps, we experience the fourth dimension in the same way, except at a much much much much higher frame rate. (About 10^150 fps!) Also, each frame, instead of being a 2-D projection of 3-D space (like a camera's recording), is a 3-D projection of 4-D time! Crazy, I know. So if you were to view yourself from an outside kind of view in the 4th dimension, you would looks somewhat like the picture above. If you've ever seen the movie Interstellar, you've seen something similar to this. {SPOILERS} When my boy Mcconaughey goes into the black hole near the end of the movie, he's thrown into a crazy looking structure called a "Tesseract". A Tesseract is a 4-D representation of a cube, basically, and if you were to go inside of one, (Which you can't. Sorry to disappoint.) you would be in a space where you could impose free will over time. In the 4th dimension, time is one of two possible directions you can move in. (This is why Mcconaughey can find specific places in time to communicate with his daughter.) So back to the picture. Basically you would look like that in the 4th dimension because, since time is now relative to you, you would see your entire existence as one object. (You at the moment of your conception would be at one end, and you at the moment of death would be at the other.) Of course, it would be far more complex than the picture because this structure would contain a "snapshot" of you at every single point in time during your entire life. Also, each instant would be 3-dimensional instead of two-dimensional. Crazy stuff indeed.