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"Flatland" was first published in 1884. At that time, the industrial revolution had not yet been completed and modern physics was nowhere to be seen. However, the book had already begun to imagine dimensional space, more than 100 years before "Three Body" discussed the issue of dimensions. Since its publication, it has inspired countless masters and literary creations, been adapted into animation four times, and appeared in popular culture fields such as the movie "Interstellar" and the TV series "Star Trek". Its popularity is evident. ? This is a memoir written by Square, a resident of Flatland. The memoir is divided into two parts. The first part talks about "my country". The two-dimensional square shows his country to us three-dimensional people, including the social structure, climatic conditions, historical events, etc. Of the flat country. The second part talks about "his country". The square is visited by the "celestial sphere" of the same kind in the third dimension, and has the honor to travel with it. The country - the country of straight lines, the country of space and even the country of points. This opened up the mind, made a leap in thinking, and upgraded the cognition. As a result, he was imprisoned. He left this masterpiece in prison in the hope that those of us "citizens of the sky" who are lucky enough to read it will not be limited by dimensions, and explore infinite possibilities while upholding humility.

"Flatland: A Romance of Many Dimensions" (Flatland: ARomance of Many Dimensions) is a satirical novella published in 1884 by the British teacher Edwin A. Abbott. Abbott used the fictional two-dimensional flat country's national "square" in this book to express a sharp commentary on the class system of the Victorian era. The novella's longer-term contribution, however, is its examination of dimensionality. Among the many editions of this book, there is a preface written by the famous science fiction writer Isaac Asimov, who commented that "Flatland" is "the best way one can find to feel the concept of dimensions." The book therefore remains popular with students of mathematics, physics, and computer science. Additionally, several movies have been adapted from the book. It can be used as an introductory book to the recently popular "Interstellar".