Ключевые слова: abstract, accumulation, background, chippings, closeup, cluster, colourful, crushed, crushed gravel, different, drainage, dugout material, frame, full, grit, loose, material, mineral, natural, nature, outdoor, pebble stone, pebbles, porous, rocks, rocky, round, shape, stones, surface, texture, textured, various, vivid, waterpermeable,