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sky cloud gradient dawn dusk sunset sunrise pink purple blue orange yellow nature weather atmosphere stratus cumulus cirrus altostratus nimbostratus stratocumulus cumulonimbus contrail cirrocumulus cirrostratus altocumulus lenticularis mammmatus undulatus castellanus floccus nebulosus stratiformis cumuliformis intortus radiatus lacunosus undulatus Kelvin-Helmholtz Von Karman Billow cat's paw mare's tail fish scale Spanish mackerel mackerel sky