Ключевые слова: abstract, bend, black, chimney, circles, closeup, concentric, concentrically, corrugated, crimped, curve, distance, flue, funnel, goffer, goffering, gray, grey, industrial, iterant, light, line, metal, metallic, monochrome, periodic, pipe, reflection, reiterative, reverberation, row, seriate, sinuous, stretch, texture, tortuous, tube, tubing, tunnel, turn, vent, ventiduct, ventilation, white, winding, zinc,