In this article, the author features "Flatland," by Edwin Abbott, a fantastic story about a square who lives in a two-dimensional world and who receives a visitor from the third dimension. Written in 1884 by a teacher-theologian who dabbled in mathematics, the novel is full of rich themes, including social class structure, the treatment of people who are different, stereotyping of women, and the existence of higher dimensions that one cannot see. The author uses the movie version of the book--"Flatland: The Movie" (2007; available at www.flatlandthemovie.com)--in her geometry classes as an introduction to the concepts of points, lines, planes, and space. The classic novel introduces students to core geometry concepts, engages them in spatial visualization, and provides rich, cross-curricular learning opportunities.