The first month of the lunisolar calendar is called the yuan month, and in olden times night was called xiao in Mandarin. Therefore, the day is called Yuan Xiao (元宵) Festival in China. The fifteenth day is the first full moon of that lunisolar year. According to Taoist tradition, the fifteenth day of the first lunar month, Shàngyuán, corresponds to the "Official of Heaven," who enjoys bright and joyful objects, so there should be thousands of colorful lanterns hung out for people to appreciate. At this time, people will try to solve puzzles on lanterns, eat glutinous rice balls named after the festival, yuanxiao (also known as tangyuan (simplified Chinese: 汤圆; traditional Chinese: 湯圓; pinyin: tāngyuán) and enjoy a family reunion.