Wood blocks with nail securing elements

Claim 1

AN UPRIGHT WALL COMPRISING, IN COMBINATION, A PLURALITY OF SUPER-IMPOSED COURSES OF DIMENSIONALLY UNSTABLE BLOCKS MADE OF WOOD, EACH OF SAID WOOD BLOCKS GENERALLY HAVING A PARALLELPIPED SHAPE, A WIDE LONGITUDINALLY EXTENDING GROOVE IN THE LOWER FACE THEREOF DEFINED BY INWARDLY INCLINED SIDE SURFACES AND A WIDE AND FLAT BOTTOM SURFACE OF A WIDTH SUFFICIENT TO EXTEND OVER A LARGE PORTION OF THE WIDTH OF SAID BLOCK, A WIDE LONGITUDINALLY EXTENDING UPWARDLY PROJECTING TONGUE ON THE UPPER FACE OF SAID BLOCK DEFINED BY INWARDLY INCLINED SIDE SURFACES AND A FLAT TOP SURFACE BY A WIDTH SUFFICIENT TO EXTEND OVER A LARGE PORTION OF THE WIDTH OF SAID BLOCK, SAID GROOVE AND SAID TONGUE BEING OF WIDTH AND SAID GROOVE BEING APPRECIABLY DEEPER THAN SAID TONGUE IS HIGH AN AMOUNT PROVIDING FOR MAINTAINING SPACED PARALLE LINES OF CONTACT OF THE ADJACENT BLOCK WHEN SAID BLOCK IS WARPED ARCUATELY TRANSVERSELY, SAID BLOCKS FORMING IN COMBINATION A STABLE UPRIGHT WALL HAVING CAVITIES IN THE CENTRAL PORTION.