An upside down rainbow looking like a colorful smile lights up sky over Songjiang town in Central China’s Hunan province on May 12, 2015. The optical phenomenon, called a circumzenithal arc, is rarely seen outside the polar regions. The phenomenon is similar in appearance to a rainbow, but it belongs to the family of halos arising from refraction of sunlight through ice crystals, generally in cirrus or cirrostratus clouds, rather than from raindrops. (Photo: China News Service/ Lu Xin)

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