In Chinese tradition, a full moon symbolizes family reunion,
especially the one in mid-autumn. Around the end of the Yuan dynasty,
the Han people in China tried to overthrown the mongolian government.
They found a smart way to spread the news:
they hid a small piece of paper in each moon cake calling people to rise
against tyranny on the night of mid-autumn. This is why people eat
moon cakes on this special night of full moon ever since.