Patent ID: 8100380

Claim:
A building block mold comprising a shell defining a pair of generally cuboid mold portions joined with one another at respective inner sides of the mold portions, the shell comprising: a bottom wall spanning a bottom end of each mold portion; an opening spanning a top end of each mold portion opposite the respective bottom wall; an outer side wall spanning between the bottom end and the top end of each mold portion at an outer side of the respective mold portion opposite the respective inner side joined with the other hold portion; a pair of end walls spanning opposing ends of each mold portion such that each end wall extends between the top and bottom ends of the respective mold portion and extends between the respective inner and outer sides of the respective mold portion; the inner sides of the respective mold portions being at least partially open such that the mold portions are at least partially open to one another at the inner sides thereof; and the mold portions being offset from one another along a plane of intersection of the mold portions within which each of the inner sides of the respective mold portions span such that: the mold portions are offset from one another in an upright direction extending between the top and bottom ends of the mold portions; and the mold portions are offset from one another in a lateral direction extending between the end walls of each mold portion; an inner side wall spanning in the upright direction between the bottom walls of the mold portions; and an inner side wall spanning in the lateral direction between each end wall and a corresponding one of the end walls of the other mold portion; wherein opposing ones of the end walls of the mold portions taper inwardly towards one another from the top end to the bottom end of the mold portions such that the outer side wall of each mold portion is generally trapezoidal in shape.