Ключевые слова: abstract, aluminum, architecture, background, barrier, black, blue, border, building, cage, city, closeup, color, concept, construction, decoration, design, detain, elements, fence, freedom, garden, glass, grate, grid, grill, grille, industrial, industry, iron, jail, line, link, linkage, metal, metallic, nature, outdoor, pattern, prison, protection, safety, security, sky, steel, street, texture, wall, warning, wired,