Popular science knowledge: Imagine four dimensions

I read a popular science pamphlet very early on, saying that there are a group of small people living in a two-dimensional plane, in a two-dimensional world, there is no concept of up and down, only before and after. In three dimensions, we are literally "gods" to them. When they are locked in a "mouth" shaped room and cannot escape, the "miracle" allows them to escape from the third dimension (above and below). Well, it's science, isn't it? ^_^. The same is true of space crossing, a piece of paper diagonally, no matter how the paper is folded, the two-dimensional man must stick to the paper to walk the same distance, and for us three-dimensional people, the two corners of the folded paper is just a line. What about four-dimensional people? Is it the "god" of us three-dimensional people? Ahh...