angles appearance backdrop background backgrounds barrier blocks chipped chiseled constructed fitted historic large limestone lines mortar old patched patchwork perspective perspectives rough secure security solid stone stones stonework strength strong surface surfaces texture textures variations variety wall walled well-built abstract coloring colors colouring colours linear rock rock-face rockface contours contrast contrasts deteriorating weathered weathering cracks discoloration lichen moss foundation foundational growth height high plants retaining retaining-wall adherence adhering aerial-roots architectural-elements boundary bricks climber climbing-vine clinging cover coverage creeper decorative distinctive evergreen foliage ivy light ornamental peaceful rocks shade shadows stone-wall sturdy sunlight sunshine tenacious trees variegated vigorous vines walls