Two-Dimensional Talk

Regarding this book, I would like to say that it is a science fiction book that is not very relevant to our lives. Because all the events in this book take place in two-dimensional space, and we live in a three-dimensional world. Someone has said that one-dimensional space is a line, two-dimensional space is a surface, and three-dimensional space adds an extra z-axis to the plane rectangular coordinate system. I really like this statement, so what exactly happens on one side? That's what this book is about.