Edwin Abbott Abbott 
Flatland: A Romance of Many Dimensions (Illustrated) [EPUB ebook] 

Abbott’s best-known work is his 1884 novella Flatland: A Romance of Many Dimensions which describes a two-dimensional world and explores the nature of dimensions. It has often been categorised as science fiction although it could more precisely be called "mathematical fiction". With the advent of modern science fiction from the 1950s to the present day, Flatland has seen a revival in popularity, especially among science fiction and cyberpunk fans. Many works have been inspired by the novella, including novel sequels and short films. (Wikipedia)