Patent ID: 8388401

Claim:
A plurality of structural members configured to be coupled together to form an array, each structural member comprising: a top portion having a plurality of top extending members spaced apart from one another; and a bottom portion having a plurality of bottom extending members spaced apart from one another, the top extending members and bottom extending members being vertically offset from each other, wherein the top portion of each structural member is configured for coupling to the bottom portion of another structural member, and each top extending member of a structural member is configured to be coupled to a bottom extending member of another structural member, wherein the structural members have three top extending members and three bottom extending members, and the three top extending members are formed with a same height so that coupling of the plurality of structural members to one another results in a plurality of layers having a uniform height, wherein each of the plurality of top extending members has a first opening and each of the plurality of bottom extending members has a second opening, and a passageway extends between each first opening and a corresponding, offset second opening.