[ Statues and works of art made of materials, in particular stone, concrete and marble, included in the class; prefabricated non-metal structures in the nature of birdbaths, sheds, aviaries, masonry letter-boxes, and transportable buildings; floor tiles, not of metal; floors, not of metal; wall tiles, not of metal; non-metallic constructions blocks of stone or marble; non-metallic construction bricks; household ornaments of stone or marble ]