Ключевые слова: abstract, arrest, background, blue, border, boundary, cage, chain, chainlink, crime, curtain, danger, design, detain, enclosure, fence, forbidden, frame, freedom, grate, grid, guard, iron, isolated, jail, keep, link, linkage, mesh, metal, metallic, net, pattern, pillars, prevent, prison, prisoner, protection, safety, security, silhouette, sky, steel, texture, trespass, wall, white, wire, wired, zoo,