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 accommodation apartments balconied balconies covered distinctive flats home house linear modern modernistic row secure structured surfaces tiling units views windows architectural contrasting heights mixed patterns Sentose shaped Singapore structures styles surface surfaced textured