Ключевые слова: activity, art, at, background, building, business, color, communication, computer, concepts, cone, construction, danger, design, forbidden, icon, ideas, illustration, industry, internet, isolated, men, metal, nobody, objects, objects equipment, on, orange, page, painting, repairing, road, safety, shape, sign, site, symbol, technology, texture, three dimensional, warning, web, white, woman, work, worker, working, yellow,