Ключевые слова: abstract, background, barb, barbed, barricade, barrier, black, border, boundary, closed, concepts, crime, criminal, danger, dangerous, dark, edge, element, fence, forbidden, frame, freedom, gray, horizontal, line, mesh, metal, military, monochrome, nobody, old, prison, private, protection, protective, razor, safety, security, sharp, sign, silhouette, sky, spiral, steel, stop, wall, war, warning, wire, wired,