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