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Flatland is uniquely both a social critique and a primer on multi-dimensional geometry. Written in two parts in 1884 by Edwin A. Abbott, an English mathematician and theologian, it tells the story of a square living in Flatland: a two-dimensional realm. After a dream of a restrictive one-dimensional existence and the difficulties this poses, he is visited by a sphere from a three-dimensional space who wishes to enlighten him into the ways of "Upward, yet not Northward."