Patent ID: 8793957

Claim:
A unitary cellular building block comprising: a beam having a top surface and a bottom surface; a first leg extending substantially perpendicular from the top and bottom surfaces of the beam, the first leg having an inner edge defining a first leg dimension at the intersection of the inner edge and the top surface of the beam; a second leg extending substantially perpendicular from the top and bottom surfaces of the beam, the second leg having an inner edge defining a second leg dimension at the intersection of the inner edge and the top surface of the beam; wherein the distance between the first and second leg dimensions is within a threshold amount of one half the length of the beam; wherein the inner edge of the first leg extending from the top surface of the beam is shaped complementary to the inner edge of the second leg extending from the bottom surface of the beam; and wherein each of the first and second legs defines a fastener on an inner edge of a first end portion and a receptacle complementary to the fastener on a second end portion located on an opposite side of the beam from the first portion.