We All Know 3D, But What Would 4D Look Like?

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Thanks to the success of films like "Avatar," we're all keenly aware of the difference between something 2D and something 3D. But what about something that's 4D? Could we even see or comprehend it? That's precisely the question that this video poses.

If we can't see it, though, why are we even thinking about 4D? Einstein's Special Theory of Relativity states that the fourth dimension is time (inseparable from space, and known as "space-time"). Currently, we can only travel forward through time, at a fixed pace.

Understanding the fourth dimension could reveal possibilities for time travel. Even if they're invisible, higher dimensions still shape the nature of our existence, which is why physicists are fascinated by them.