Patent ID: 6854231

Claim:
A wall having a front surface and a rear surface, the wall comprising: at least a first lower course and a second upper course, each course comprising plurality of block; each block having an upper surface spaced apart from a substantially parallel lower surface, thereby defining a block thickness; opposed and substantially parallel first and second faces, the first face having an area greater than the second face; opposed and non-parallel side surfaces, the first and second faces together with the upper, lower and side surfaces forming a block body; the lower surface having first and second channels substantially parallel to the first and second faces, the first and second channels being equidistant from the first and second faces, respectively; and the blocks being positioned the courses such that the front surface of the wall is formed from the first faces of some of the multiple wall blocks and the second faces of others of the multiple wall blocks, such that the first channel in a first block aligns horizontally with the second channel in a second blook in the same course when the first block's first face forms the front surface of the wall and the second block's second face also forms the front surface of the wall.