Ключевые слова: abstract, army, background, barb, barbed, barbwire, barrier, black, blur, boundary, circle, closed, color, crime, danger, dangerous, defense, enclose, fence, forbidden, frame, freedom, green, guard, horizontal, imprisonment, iron, jail, light, link, mesh, metal, military, obstacle, pattern, prevent, prison, protect, protection, sharp, silhouette, spiked, spiky, steel, surveillance, war, wire,