The first month of the Chinese calendar is called yuan month, and in ancient times people called night xiao; therefore, the day is called Yuan Xiao Festival in China. The fifteenth day is the first night to see a full moon in that lunar year. According to Chinese tradition, at the very beginning of a new year, when there is a bright full moon hanging in the sky, 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 yuanxiao ('元宵'in chinese) (a glutinous rice ball, also known as simplified Chinese: 汤圆; traditional Chinese: 湯圓; pinyin: tangyuán) and enjoy a family reunion.