Somewhat abbreviated title of
Flatland: A Romance of Many Dimensions, a 19th century text about living in a world of
two dimensions. It was allegedly written by Flatland inhabitant
A. Square and edited for our perusal by English scholar
Edwin A. Abbott, but it doesn't take the
Chief Circle to determine the true story behind the book's
authorship.
In addition to describing the two-dimensional realm, the book introduces us to various zero, one, and three-dimensional creatures, and dares us to dream about the possibilities of the Fourth Dimension and higher. Of course, it's also a very thinly-veiled satire of Victorian society. :) Take from it what you wish...
Go ahead and read it yourself.