My college room-mate Alan Wold, in his book Jewels of the Dragon (1986) used a similar idea.

There was a city or two cities (I forget the names) consisting of two superimposed square grids of streets and blocks, arranged so that the street intersections of each grid lay exactly at the centers of the blocks of the other grid. With this arrangement, the streets of each grid did have to cross the streets of the other, but the crossings were "unseen" by the inhabitants of either city, who were as I recall two races alien to each other and likewise mutually un-noticed.

In the plot of the novel, this equilbrium is disrupted when the protagonists, inhabitants of one of the two cities, begin to notice the other.

Eric

Last Edited By: halsey May 28 09 11:38 AM. Edited 1 time.