The book takes the form of a memoir written by a square living in a fictional 2D world called Flatland. There are three major themes
- The social hierarchy of the citizens (i.e., 2D shapes) in Flatland.
- A historical movement in Flatland of using technology (color) to overthrow aristocracy and establish equality among all 2D shapes, and how it ended.
- The square’s ‘religious’ experience with a sphere from the 3D world Spaceland, and what happens to an apostle to spread the gospel of The Third Dimension.
This is a fun book to read and I highly recommend it. It is currently in the public domain (first published in 1884) so there are many free versions available. For example, I read the free Kindle AmazonClassics Edition (which lacks the illustrations).