Abstract: A retaining wall system has a number of units placed on top of the other. The units are constructed to be capable of interengaging one another in a plurality of selected positions so that the angle of the face of the resulting wall to the vertical can be different at different heights. Preferably the upper surface of each unit is substantially convex and the lower surface of each unit is a substantially complementary concave configuration. The blocks engage complementarily in more than one possible relative position and are shaped to resist being displaced therefrom by lateral forces.

Abstract: A paving block has six sides, and a top (10) and a bottom surface (12). Two of the side surfaces (14, 16) are substantially parallel and substantially twice as long as each of the other four side surfaces (18, 20, 22, 24), two surfaces (18, 20) of the said other four side surfaces each making an angle of substantially 120.degree. with one end of each of the longer side surfaces (14, 16) and each other side surface (22, 24) making an angle of substantially 60.degree. with the other end of each of the longer side surfaces (14, 16). In other words, a block according to the invention as seen in plan is of `chevron` shape a shape that could also be termed a squat `V` shape. This is a simple, easily manufactured block, which permits numerous different arrangements to be laid.