Stackable bricks and their procedures for stacking

A rectangular stackable brick is provided having substantially parallel opposing top and bottom surfaces, substantially parallel opposing side surfaces and substantially parallel opposing end surfaces. The length of the brick is approximately twice the width of the brick so that the top and bottom surfaces each define first and second square regions. The top surface includes a first column which projects upwardly from the center of a first square region and a second column which projects upwardly from the center of a second square region. The bottom wall of the brick includes a recess sized and configured for receiving the first and second columns. The recess extends from an end wall along the center of the length of the brick sufficiently far so that the brick can be stacked upon other bricks of like construction.