Ключевые слова: abstract, background, barrier, blue, board, cage, clouds, design, detain, enclosure, environment, fence, field, green, grid, illustration, industrial, industry, iron, isolated, jail, linkage, mesh, metal, mountain, natural, nature, net, outdoor, outside, pattern, prison, protection, red, season, security, sky, summer, sun, system, technology, texture, textured, tree, wall, wire, wired,