Flatland: Romance of Many Dimensions
Roberts Brothers, 1885 - Fourth dimension - 155 pages
In a two-dimensional universe populated by a hierarchical society of geometric figures, a square is persecuted for attempting to reveal its new knowledge of a third dimension, learned from encounters with a sphere.
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Flatland is one of the best books I've ever read. This book expanded my understanding of the 4th and greater spatial dimensions. But be warned: you need imagination and a willingness to think in order to make this book really count.