Ключевые слова: background, beacon, blue, bridge, bright, buoy, calm, danger, dangerous, day, energy, fairway, far, float, floating, flow, house, landscape, lifebuoy, lifetube, nautical, navigation, no people, norrland, object, pointer, post, red, red buoy, reflection, refraction, rescue, river, riverbank, round, safety, save, security, sign, signal, speed, surface, sweden, swirls, tilt, travel, umea, warning, water, waves,