Therefore, Judaism embraces the commemoration of the day of one's death, nahala/Yahrtzeit and not the birthday as a festivity of remembrance, for only toward the end of life's struggles, tests and challenges could human souls be judged and credited for righteousness. Judaism places great importance on the study of the souls. Kabbalah and other mystic traditions go into greater detail into the nature of the soul. Kabbalah separates the soul into five elements, corresponding to the five worlds: Nefesh, related to natural instinct. Ruach, related to intellect and the awareness of God. Neshamah, related to emotion and morality. Chayah, considered a part of God, as it were. Yechidah. This aspect is essentially one with God. Kabbalah also proposed a concept of reincarnation, the gilgul. (See also nefesh habehamit the "animal soul".) Some Jewish traditions assert that the soul is housed in the luz bone, though traditions disagree as to whether it is the atlas at the top of the spine, or the sacrum at bottom of the spine. Scientology The Scientology view is that a person does not have a soul, it is a soul. It is the belief of the religion that they do not have the power to force adherents' conclusions. Therefore, a person is immortal, and may be reincarnated if they wish. Scientologists view that one's future happiness and immortality, as guided by their spirituality, is influenced by how they live and act during their time on earth. The Scientology term for the soul is "thetan", derived from the Greek word "theta", symbolizing thought. Scientology counselling (called auditing) addresses the soul to improve abilities, both worldly and spiritual. The ideologies surrounding this understanding align with those of the five major world religions. Shamanism Soul dualism (also called "multiple souls" or "dualistic pluralism") is a common belief in Shamanism, and is essential in the universal and central concept of "soul flight" (also called "soul journey", "out-of-body experience", "ecstasy", or "astral projection"). It is the belief that humans have two or more souls, generally termed the "body soul" (or "life soul") and the "free soul". The former is linked to bodily functions and awareness when awake, while the latter can freely wander during sleep or trance states. In some cases, there are a plethora of soul types with different functions. Soul dualism and multiple souls are prominent in the traditional animistic beliefs of the Austronesian peoples, the Chinese people