system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5--- Higher dimensions. just can't get my head around it. please. someone.

I have read the book Flatland so i get how there can be a higher dimension but I just can't comprehend it. If you have a way it can be visualised or even explained a lil bit, please tell me. 
Thankyou for your time!
gpt
So presumably, you know at this point how a 3D sphere looks passing through a 2D universe, right? It starts off not existing, then it becomes a small circle, grows to a larger circle, shrinks to a smaller circle and then ceases to exist again. a 4D hypersphere does the same thing in the 3D universe: It spontaneously appears as a small 3D sphere, grows larger, then shrinks and finally disappears. 

That's the best visualisation of four dimensions that we can possibly have, because our brains are only three dimensional. We are literally incapable of visualising higher dimensions, similar to how we can't possibly imagine a colour that doesn't exist. We can talk about and think about how that would occur and how it would interact with the world, but we can't imagine what it would look like.