Ключевые слова: abstract, acute, background, barbed, barbwire, barrier, block, bob, border, boundary, building, camp, concentration, concrete, construction, curved, defense, edge, enclosing, enclosure, fence, fencing, forbidden, gray, guard, industrial, industry, long, metal, military, obstacle, old, perspective, prison, prohibition, razor, safety, secured, security, sharp, steel, stonewall, structure, surface, symbol, texture, thorn, top, wall, wire,