architecture background basis classic cloister column columns element elements saavem stone texture downsatairs handrail interior interiors porto stair stairs upstairs abstract erode erosion nature rock rocks stratification stratified stratum cobweb Dirt dirty metal oxide oxidized rust rusted blue chimney chimneys double rural sky traditional decay old rusty urban vintage wood fire flame industrial industry pipe place refinery door rustic wall building front green tile tiled tiles cuisine fat grease meat muscle rib ribs salad galicia red typical white window