Seed base is another name of "buried base", which originated from Taoism in Jiangxi. This technique originated from ancient customs, and Hakka people also have the saying of "burying the foundation", which means burying it alive. For example, "if the lottery goes fast and the mountain mud collapses, it is necessary to' bury the foundation'."
It turns out that the purpose of burying people alive and faking their deaths once in the seed base is to deceive the immortal officials who enforce the law and avoid disaster. Later, it evolved into the technology of "Yin and Yang Zhai Yong", in which body double was buried in advance to absorb the atmosphere of Longdong, prolong his life and increase his happiness. The reason is similar to that of ordinary people who build "longevity sacrifices" or set up "life sacrifices" for officials or benefactors to return their merits to benefactors.