Patent ID: 8157608

Claim:
A construction module, comprising: (a) a vertical linear axis (b) a plurality of planar walls, said plurality of planar walls comprising a first set and a second set of planar walls; (c) said first set of planar walls, having n-order rotational symmetry about said vertical linear axis and comprising n identical subsets, n being greater than one; (d) said identical subsets, each comprising a planar wall inclined obliquely to said vertical linear axis, being a 360°/n rotation of another said identical subset about said vertical linear axis, and, when viewed along said vertical linear axis, occupying a circular sector around said vertical linear axis no greater than 180°/n; (e) said second set of planar walls, being mappable onto said first set of planar walls by reflection across a horizontal mirror plane followed by a 180°/n rotation about said vertical linear axis; (f) said first and second sets of planar walls, every portion of each being noncollinear with every other portion of said construction module, said noncollinearity existing along vertical lines; and whereby a planar wall of one said construction module may be abutted, face to face, with a mirror image planar wall of another identical module, and whereby said construction module may be molded in one piece with a straight pull mold whose axis of mold pull parallels said vertical linear axis.