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.
Supernatural
Reincarnation is the philosophical or religious concept that an aspect of a living being starts a new life in a different physical body or form after each biological death. It is also called rebirth or transmigration, and is a part of the Saṃsāra doctrine of cyclic existence. It is a central tenet of all major Indian religions, namely Jainism, Hinduism, Buddhism, and Sikhism. The idea of reincarnation is found in many ancient cultures, and a belief in rebirth/metempsychosis was held by Greek historic figures, such as Pythagoras, Socrates, and Plato. It is also a common belief of various ancient and modern religions such as Spiritism, Theosophy, and Eckankar, and as an esoteric belief in many streams of Orthodox Judaism. It is found as well in many tribal societies around the world, in places such as Australia, East Asia, Siberia, and South America.