Eating moon cakes is one of the important activities. There are three interpretations about its origin. Firstly,as the story goes, it was evolved from the custom of presenting the elderly glutinous rice cakes to show their respect. Another interpretation traces its origin to the Yuan Dynasty. The leaders of rebellors against the rule of Yuan nationality inserted into moon cakes the notes calling for uprising. When people ate cakes,they saw the notes and answered to the call for rebellion. Since then, it has become a custom to eat moon cakes. Still another interpretation is that eating round moon cakes on a full - moon night symbolizes family reunion.