Ключевые слова: architectural, architecture, building, buildings, chicago, city, city life, cityscape, cloud, day, downtown, exterior, facade, facades, grayscale, greyscale, high rise, highrise, highrises, horizon, illinois, keith levit photography, office block, outdoor, outdoors, outside, sky, skyline, skyscraper, skyscrapers, structure, sun, sunny, sunshine, tower, tower block, urban, urban scene, usa,