Ключевые слова: abstract, background, barrier, border, cage, chain, chainlink, construction, dangerous, design, element, enclosure, equipment, fence, field, grate, green, grid, industrial, industry, iron, link, macro, material, mesh, metal, metallic, net, netting, nobody, pattern, peeled, protection, rust, safety, security, shape, sky, spot, stainless, steel, sun, texture, textured, through, up, wall, wallpaper, web, wire,