Since the Middle Ages, Jews have been trying to interpret the complex world and find humanity's place within it. The Kabbalah served this purpose, incorporating models from philosophy as well as language, teachings about angels and demons, and the concept of divine animism. A knowledgeable person can use these insights as a magician and become a partner of God in the preservation and shaping of the world. According to Kabbalah, the divine fluid flows through everything; human souls inhabit human bodies, animals, plants, and minerals through the process of soul transmigration (Gilgul). Rites and the fulfillment of commandments are reinterpreted—thus, even a daily meal becomes a sacramental act. Karl Erich Grözinger presents the various Kabbalistic models, culminating in the Book of Zohar, which weaves all these threads into a fantastic narrative literature, and the Eastern European Chassidism.