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"Flatland: A Multidimensional Legend" is a science fiction novel. The protagonist in the book claims to be a square and was born in Flatland, which is populated by various flat shapes. The whole book is divided into two parts. In the first part of the book, Square introduces the climate, architecture, population, law, politics and other social features of Flatland through his own perspective. These vivid and interesting descriptions ruthlessly expose and satirize the social hierarchy of the British Victorian era. The author uses various graphic analogies to display the characters at all levels of society in real life, which makes readers marvel. His in-depth analysis of the social system makes people laugh. The second part of the book tells the fantastical story of how Square gained knowledge of the third dimension and then attempted to spread that gospel to the rest of Flatland. This part makes a bitter mockery of the arrogance and ignorance of human beings (especially the upper class). As the author said in the preface, the purpose of this book is to "cultivate that rare virtue--humility among the upper classes."

In the eyes of people in the one-dimensional world, a person who can move forward, backward, left, and right is a god, because he can suddenly appear and disappear (move to the left or right of the straight line, and people in the straight-line country will not see you); in the eyes of people in the two-dimensional world, a person who can move up and down is a god, because he can suddenly appear and disappear (move above or below the plane, and people in the flat country will not see you); So in our three-dimensional world, is it a god or a person in the four-dimensional world that can suddenly appear or disappear?