Sui generis
In sociology, the "sui generis" is what has been externalized, then internalized in the overall public and becomes a part of society that simply exists in its construct. It is not something that is not thought to have been created, because it is imbedded in everyone's way of thinking and being. Instances include the idea of love, or going to school, or clothing belonging to a specific gender. These examples are "sui generis" for they simply exist in society and are widely accepted without thoughts of where they come from or how they were created.
List of supernatural beings in Chinese folklore
"Shui gui" () are the spirits of people who drowned. They lurk in the place where they died, drag unsuspecting victims underwater, and drown them to take possession of their bodies. This process is known as "ti shen" (), in which the spirit returns to life in the victim's body while the victim's spirit takes the "shui gui"'s place and constantly seeks to take control of another living person's body.