Abstract: A concrete block is provided having half dovetail sections at opposite ends of the block arranged so that when placed together the dovetailed sections on adjoining blocks form a full dovetailed section which is just large enough to be received within a dovetail groove in the central portion of an adjacent identical block. The concrete blocks are provided with upper and lower longitudinal grooves for longitudinal members having the same exterior shape. In one form of the invention one side of the block may be made into a plant receptacle by providing a hollowed out section oriented upwardly. Insulating concrete blocks may also be combined with blocks formed of structural concrete to provide an interlocked wall having a portion of the wall made from insulated concrete material and another portion of the wall made from structural concrete material.

Abstract: A computer workstation is provided with a movable support for a video monitor which is counterbalanced such that it may be moved with a minimum exertion and a coordinated keypad for support of the keyboard for the computer is also arranged in a counterbalanced fashion for movement with a minimum exertion by the operator, both of such structures being coordinated together to provide a universally adjustable monitor work system station which both allows and encourages the operator to periodically make adjustments in the position of the various components so as to decrease or eliminate repetitive strain-type injuries which may be brought on by long continued exactly repetitive movements. The video monitor is adjustably supported with a dual adjustable support.