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Buddhist monks chant prayers while participating in a Huo Gong ritual at Sera Monastery outside Lhasa, Tibet. During the Huo Gong ritual, also known in Tibetan as Jinf Sah, monks in ceremony dress chant while a head monk burns prayers and offerings in a  fire.  White smoke denotes prayers for the living, and black smoke are for prayers for the deceased spirits.  Photograph by Douglas ZImmerman