Reviews of Message Found in a Copy of Flatland (1983)
Now this is a must. The mores of Flatland, the two-dimensional world populated by geometrical shapes, are so bizarre. But when you are limited to only two dimensions, life is defintely very different. It is a fascinating exploration of a world more alien than any SF or Fantasy ever was. Because very few authors envisioned a number of dimension different from three, and the only other ones I know have more, not less.