Ключевые слова: abstract, africa, against, background, barb, barbed, barrier, blue, border, boundary, cage, camp, cement, closed, coils, concrete, crime, danger, dark, design, empty, enclose, fence, ferroconcrete, forbidden, freedom, guard, imprisonment, industry, iron, jail, mesh, metal, military, nobody, obstacle, penitentiary, prison, protection, razor, robben, security, sharp, sky, wall, warning, wire,