"Stone from the outer rim of an enormous square is dynamited and then cast into large concrete/stone blocks, dyed black. Each is about 25 feet on a side. They are deliberately irregular and distorted cubes. The cubic blocks are set in a grid, defining a square, with 5-foot wide “streets” running both ways. You can even get “in” it, but the streets lead nowhere, and they are too narrow to live in, farm in, or even meet in. It is a massive effort to deny use. At certain seasons it is very, very hot inside because of the black masonry’s absorption of the desert’s high sun-heat load. It is an ordered place, but crude in form, forbidding, and uncomfortable."
Illustrations for designs to warn people away from contaminated areas with the idea that these people might not understand the writing or the actual reason for the danger.