Interlocking retaining wall apparatus

An interlocking retaining wall apparatus arranged along a wall run, for retaining a supported mass which exerts a force on the wall apparatus comprising:

• plural annular structures constructed and arranged to interlock with one another to form a wall, each annular structure having a truncated generally right-conical exterior surface including an axis therefor, a generally right-cylindrical interior surface including an axis therefor, wherein:
• said axis for said interior surface is coincident with said axis for said exterior surface;
• each of said annular structures includes a flat top surface and a flat bottom surface, said top and said bottom surfaces being constructed and arranged to be substantially normal to said axes;
• said annular structures are arranged in the apparatus such that, when stacked on top of another, said flat top surface of an inferior annular structure underlies, and is at least partly covered by, said flat bottom surface of a superior annular structure;
• said annular structures are arranged in horizontally extending rows wherein a row is stacked vertically on a lower row and a laterally adjacent annular structure located in an adjacent vertical row partially overlays another such annular structure in another row, defining an adjacent overlay surface, said overlay surface having at least two curved sides thereto, wherein each overlay surface includes a minor axis and a major axis and wherein said axes are normal to one another;
• wherein each of said major axes extends parallel to said force, and wherein each of said minor axes extends normal to said force and extend parallel to the wall run;
• and
• said plural annular structures being arranged, at least two structures high, in frictional engagement with vertically and laterally adjacent annular structures, to provide a wall which is substantially free of gaps when viewed from the side thereof.