Ключевые слова: abstract, background, black, ceiling, cigarette, circle, color, communication, concept, detail, dont, forbidden, graphic, green, health, icon, illustration, landscape, leaf, light, lonely, metal, nature, no, non, outdoor, park, permitted, person, plate, public, restaurant, risk, road, safety, sign, signage, smoke, spring, steel, stop, street, support, symbol, traffic, transportation, walk, warning, white, wooden,