Cut off at one angle and glued together, they produce a square house; on a different angle, a hexagonal or octagonal house. You can glue sections together into an irregular zigzag shape, or make them into a long looping string, with branches or protrusions, enclosing a sort of compound—a common pattern for extended-family groups living in open country. You can build a central space out of wood or stone and attach extruded rooms onto the outer edge. You can cut doors or windows with a few minutes’ work. And not only can the sections be glued together by unskilled labor, their cost is very low—a
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