Ключевые слова: abstract, airport, architecture, background, barb, barbed, barbwire, barricade, barrier, black, blue, border, boundary, camp, cloud, crime, criminal, dark, defense, edge, fence, forbidden, freedom, gray, guard, horizontal, isolated, jail, line, metal, military, monochrome, night, nobody, old, prison, private, protection, protective, razor, safety, security, sharp, sign, silhouette, sky, steel, wall, war, wire,