Ключевые слова: abstract, air, atmosphere, background, beautiful, blue, blue sky, climate, cloud, cloudiness, clouds, cloudscape, cloudy, color, concept, cumulus, dream, effect, environment, figure, fluffy, fly, form, form in the sky, formation, group, heaven, high, illusion, landscape, message, meteorological conditions, meteorology, motion, natural, nature, outdoor, overcast, oxygen, ozone, paradise, prototype theory, sign, sky, skyline, space, symbol, symbols, weather, white,