background cornwall England gray Great Britain grey hard igneous natural nature red rock rough texture ancient bark cracked fissure oak old Quercus rugged tree bare barren flower habitat hill hillside landscape plant rocky Sardinia stonecrop crevice fissured lichen split Stump Castanea chestnut shadow sunlight Sussex block boulder crag firm foundling geology heavy large massive solid stone unshakable abstract angled angles appearance blocks color colour designed detailed detailing distinctive external gaps grooved grooves ground hard-surface hard-surfacing interconnected interlinked level light limestone limestone-blocks lined lines mortar outdoors outside path patterns pavement pavers paving shaped shapes Sizes stones stonework striations surface surfaces textured textures iron many nail nails random screw screws sharp shine shiny steel thousands tool tools crevasse Phellodendron protection protective fierce flow foam granite gush norway powerful rush spate spring stream strong water bar bars building closeup construction metal scaffold scaffolding stack stacked staging stuts