This film tells the story of the dimension. First of all, he told a story of two-dimensional sum, and all I want to say is something I am very interested in. But first of all, I have to say, before that, the first thing is to take the earth as an example. First of all, we should know that two dimensions are plane figures. If it is not flat, we will compress, compress and recompress the three-dimensional earth until two people come out, that is, we can dissect it and expand it, that is, an ellipse. In the picture, we can see that the South Pole and the North Pole are up and down. We can give him latitude and latitude for this. First of all, show that you are a perfect straight line between the South Pole and the North Pole. The extension point of a line segment is the south pole or the north pole, which can form a line segment. Divide this average into several parts, and it becomes the saying of latitude and longitude. In fact, this is just a small space. And lick the height below you, for example, the flight distance of the plane is about 10 km. Let's extend the question we are interested in. First of all, unique problems. The question I want to ask is what happens when two-dimensional creatures or one-dimensional creatures explore higher dimensions? First, one dimension is a line. If it's just a biological report on this line, he can only see what he can see on one line, just like if you are in a place, you can only see what's in front and not what's behind. It's even more complicated when you look up. You can't see anything. South-South market paper restriction. Even if he put the brother on a two-dimensional plane, they couldn't see anything. Like a blind man.