What is the jade cong of Liangzhu culture like?

Ritual vessels were used in ancient sacrificial activities, and jade ritual vessels were mainly used in sacrificial activities, but they did not refer to all jade articles used in etiquette, but to six kinds of jade articles, namely Bi, Yan, Gui, Zhang, Huang and Hu, which were collectively called "six vessels". Li Zhouguan's Pure Big Bo records: "Jade is a six-vessel, which is a gift to the four sides of heaven and earth, with pale walls in the sky, Huangyan in the east, Qinggui in the east, Zhang Chi in the south, White Tiger in the west and Huang Xuan in the north. There are sacrificial coins, each with its own color. " The ancients claimed that the sky was round, and the place was "the pale wall gave the sky", because the sky was round and pale (cyan); "Unlike yellow", it is because the land is yellow and square. The ancients used the color and shape of jade to match the theory of yin-yang and five elements, thus making ritual vessels to worship the four corners of heaven and earth. Etiquette is mainly used to show power on important occasions, or as a tool to increase prestige, so as to safeguard the dignity of rulers. Etiquette jade includes Yufu, Yu Qi, Yuyue, Yuge and Jade Knife, all of which are symbolic weapons.