Ключевые слова: abstract, background, barb, barbed, barbwire, barrier, black, border, boundary, camp, closed, closeup, cloud, concentration, concept, crime, danger, defense, escape, fence, forbidden, freedom, guard, industry, iron, jail, mesh, metal, military, nature, old, outdoors, prevent, prison, private, protection, razor, safety, security, sharp, silhouette, sky, spike, spiral, steel, wall, war, warning, wire, zone,