Ключевые слова: abstract, aluminum, art, backdrop, background, backgrounds, black, blue, border, boundary, cage, chain, cloud, clouds, crime, curtain, decorative, fence, frame, freedom, grate, grid, industrial, iron, jail, mesh, mesh background, metal, metallic, modern, net, ornament, pattern, prevent, prison, prisoner, protection, safety, security, shape, sky, square, steel, structure, texture, textured, white, wire, wired, zoo,