Flatland : A Romance of Many Dimensions by Edwin A. Abbott

Classic of science (and mathematical) fiction - charmingly illustrated by author - describes the journeys of A. Square and his adventures in Spaceland (three dimensions), Lineland (one dimension) and Pointland (no dimensions). A. Square also entertains thoughts of visiting a land of four dimensions - a revolutionary idea for which he is banished from Spaceland.
Binding: Paperback / softback