Alas, we don't have the four-dimensionsal equivalent of Abbott's three-dimensional sphere to show us the way to 4-D. (In mathematics, moving into ever higher dimensions is a walk in the park.

Two-dimensional experiments in 2018 showed evidence of four-dimensional existence. Electrons moved in two dimensions when influenced by a magnetic field, hinting at how a similar effect would ...

Jacqueline Hill took a two week holiday from the series during the recording of episodes four and five ... others go down to the surface of Sense-Sphere. She joins them in the final episode ...

We live in a three-dimensional reality. Because of that, it’s pretty hard to imagine what a four-dimensional reality might be like, but that isn’t stopping physicists from trying to figure it out.