eli5: what is 4D space?

Question

I just dont know what Is 4D space and i can’t imagine it…

In: 5

Answer 1

Think how differently life would be in only 2 dimensions, and how easily you could see everything going on if you were a 3rd party observer.

Now bring that up one level and you can sort of imagine what it might be like, even though we can’t actually imagine or perceive it.

Personally I do feel like time might be a dimension, as 3D worlds moves through it (albeit only one way) – in fact I’ve always thought of time as the fourth dimension in my minds eye.

But time could be the 5th or 11th dimension too, and we can’t just perceive or visualize the ones in between.