Flatterland by Ian Stewart

Like Flatland, Only More So

A witty, imaginative follow-up to a Victorian two-dimensional tale in which a young square is carried on a guided tour through worlds of higher and exotic geometries, encountering four and higher dimensions, curved and non-Euclidean spaces, topology, fractals, infinity and set theory, and ideas from modern physics; the book mixes playful dialogue, puzzles and illustrations to make deep mathematical concepts accessible and entertaining for general readers.