angles background backgrounds blue sky colors colours contrast orange roofing roofing angles roofs rooftiles rooves shapes sky. blue textures tiles abstract angled architecture building buildings diagonal edge edges gutter guttering historic lichen lines loose nails old overlap overlapping pattern roof rooftops shape slate steep style texture tile vents above angle appearance corrugated corrugations exhaust pipes grooved grooves height high metal perspectives protection rooftop safety security shadows shopping centre shops sunlight ventilation exhaust pipes ventilation system abandoned alignment closed decay deterioration Dirt dirty disrepair doors elements entrance exit exterior external foliage grime lean leaning light lopsided neglect shed structure vegetation houses white architectural architectural-elements contrasting discoloration façade home house joined linked patterns placement quality slope sloping surface surfaces terracotta textured tiled unusual wall walls accommodation apartments balconied balconies covered distinctive flats linear modern modernistic row secure structured tiling units views windows