Trying to visualize a fourth spatial dimension is interesting, but I think impossible to understand. To make a rectangular prism you could take different papers of the same size and stack them on top of each other. If you imagine the papers were infinitely thin as if it were truly 2 dimensional, this would mean the paper on top is touching every single point on the other paper. To an imaginary 2d being they would not understand how the points in the middle of one rectangle can touch the middle point of another rectangle because they can only think about moving the rectangles foward, back, left, and right. It would seem completely impossible. If someone showed them you can just move the rectangle "above" the other one and put it on top they would be amazed. So to make a 4d version of this rectangular prism, somehow you would have to have a way for a cube to touch every single part of the other cube including the middles. Just like the 2 rectangles when 1 placed on top will have the middle of it touching, the 2 cubes would have the points in the middle of them touching each other. Does this mindfuck anyone else?