Ключевые слова: abstract, background, ballast, building, building material, cement, closeup, color, colorful, concrete, construction, crushed, detail, dirt, fabrication, floor, granite, gravel, gray, ground, hard, industry, material, natural, nature, outdoor, pattern, pebble, pile, rail, road, road building, road construction, rough, rubble, sand, site, skirt, small, stone, stones, surface, texture, textured, track, underground, wallpaper, work,