The Sheng Ji is what we call the “tomb of the living.” Don’t worry, no one is buried alive. You are probably familiar with the concept of water memory. In brief, water in contact with DNA can capture it and carry it
Wikipedia
Based on the same principle, it is possible to bury items that carry a person’s DNA—such as worn clothing, hair, or a toothbrush—in a very specific location. If this environment is exceptional from a Feng Shui perspective, it is possible to harness the beneficial Feng Shui of that extraordinary place in the person’s personal and professional life. The DNA in contact with the earth allows, through the earth, this energy to be returned to the individual. This is why some people use Sheng Ji to compensate for average or negative Feng Shui, others to offset a mediocre Ba Zi or simply to enhance their potential luck.