How Can We Picture the Fourth Dimension?

Left-right, up-down, back-forth: These are the dimensional directions we’re able to perceive. Theoretical physics posits that additional dimensions could exist beyond our perceptive reach.

In this video, string theorist and World Science Festival chairman Brian Greene, author of The Hidden Reality, dives head-first into the search for extra dimensions.

The possibility of extra dimensions

The possibility of dimensions of space beyond the three that we know about is an idea that —it cropped u...