Per Wikipedia:

"Flatland: A Romance of Many Dimensions is an 1884 novella by Edwin Abbott Abbott, still popular among mathematics and computer science students, and considered useful reading for people studying topics such as the concept of other dimensions. As a piece of literature, Flatland is respected for its satire on the social hierarchy of Victorian society."

I'm posting version 1.1 to correct the spelling of the author's name. I also made a couple of minor format changes. The previous version had 17 views.