Ключевые слова: abstract, backdrop, background, barbed, barricade, barrier, border, boundary, chain, chained, design, element, enclose, enclosure, fence, forbidden, frame, freedom, grey, grid, isolated, keep, linkage, material, mesh, metal, metallic, net, netting, nobody, pattern, protect, protection, safety, seamless, security, shape, stainless, structure, surface, system, tennis court sport, texture, textured, wall, wallpaper, wire, wired,