Ключевые слова: absence, abstract, abstract backgrounds, ancient, architecture, backgrounds, building exterior, built structure, cement, closeup, color image, concrete, concrete wall, construction industry, copy space, day, dirty, empty, facade, flooring, gray, gray background, gray color, horizontal, industry, inspiration, material, no people, old, outdoors, patina, pattern, repetition, rough, shanghai, simplicity, sparse, surrounding wall, textured, wall building feature, weathered,