Ключевые слова: alert, background, blue, bright, caution, clear, clear sky, clouds, communication, day, daylight, design, direction, empty, empty space, environment, freedom, graphic, indication, isolated, isolation, landscape, message, minimalism, modern, nature, no entry, outdoor, outdoors, peaceful, prohibition, red, road, safety, scene, serene, sign, sky, stop, sunlight, symbol, traffic, transportation, travel, urban, vertical, view, warning,