But there are stories where the math is simultaneously central to the story, while also speculative enough to count as genre. . . . [Like] Robert Heinlein’s “—And He Built a Crooked House,” where a design based on a 3D projection of a four-dimensional shape actually shifts to an upper dimension during a minor earthquake.

Mathematical fiction! For a math geek who is also a literature geek, this is the sensation of geek squared. Read my full essay at AE.