Ключевые слова: abstract, background, black, bloodred, building, canalization, circle, circular, closeup, conduit, construction, corrosion, cut, cylinder, dark, diameter, drainage, duct, edge, heap, industrial, industry, iron, large, manufacturing, many, metal, objects, old, opening, organ, orifice, pipe, piping, red, round, rust, rusteaten, sewage, sewer, stack, steel, stock, store, tube, tubing, warehouse, water,