A society of sexy mathematicians exist at all size scales in an alternate-reality Westchester County, New York. A fractal train runs at different size scales and interconnects the various sub-populations. Fractal weapons, the Koch curve, and other mathematical concepts are featured.

Scattered through the book there are many evidences of mathematics being one of the two most important features in the life of Fractalians (the other is sex): the engine of their Fractal Express contains Koch curve-shaped vibration dampeners that also serve as good shurikens; the main Fractalian pastimes comprehend magic squares (even very complex ones) and Sz'kwa, a Chinese go-like game; drapes are covered with topology formulas describing their own folds. What I found most interesting was the "fractal dance" in which the smaller fractalians dance around the larger ones reproducing the Koch curve, but it's only briefly mentioned.