Ключевые слова: background, black, building, calibrated grain size, calibrated gravel, calibrated sand, close up, construction, courtyard, dry, foot step, granite, granule, gravel, gray, grey, heaps, industrial, mark, material, natural, nature, pattern, paving, pebble, pieces, pile, playground, quarry, reflection, river sand, river sand batch, road, rock, rough, sand, sandy, sifted sand, site, small, stone, texture, textured, trail, yellow,