abstract angles appearance backdrop background backgrounds barrier blocks coloring colors colouring colours constructed contours contrast contrasts fitted large limestone linear lines mortar perspective perspectives rock rock-face rockface rough secure security solid stone stones stonework strength strong surface surfaces texture textures variations variety wall walled well-built deteriorating weathered weathering cracks discoloration lichen moss architectural architecture bedrock formation heritage historic Historic site kiln kilns landscape light lime-kilns park patched patchwork repairs rock-work rocks rubble ruins shadows stairs steps stone-steps stone-wall stone-work structure sunlight surfaced surfacing textured trees varied vegetation walls clouds grass green mountains outdoors sky space summer basic exterior external firm rock-wall rugged shaped shapes style sunshine uneven various wallpaper