Ключевые слова: abstract, backdrop, backgrounds, black, border, butting, computer, connection, construction, defense, distinction, divide, edge, enclosure, fence, geometric, grate, gray, guard, hex, hexagon, keeping, limit, material, mesh, metal, metallic, mosaic, netting, nobody, palisade, pattern, protection, security, shape, shield, smooth, steel, structure, support, symmetry, techno, technology, verge, white, wire,