Unus mundus, Latin for "one world", is the concept of an underlying unified reality from which everything emerges and to which everything returns. The idea was popularized in the 20th century by the Swiss psychoanalyst Carl Gustav Jung, though the term can be traced back to scholastics such as Duns Scotus and was taken up again in the 16th century by Gerhard Dorn, a student of the famous alchemist Paracelsus. — Carl Jung, Mysterium Coniunctionis