Sky lanterns float into the night during the Chinese Sky Lantern Festival in Pingsi, Taiwan on February 7, 2009. According to the elders of Pingsi, the tradition of releasing lanterns began during the Ching Dynasty when bands of outlaws frequently raided villages around Pingsi, forcing local residents to seek refuge in the mountains. The lanterns were signals used by the village watchmen to inform the refugees that their houses were safe again.