In Taoist Internal Alchemy the lower Tan Tien or "Elixar Field" is known as the Cauldren, because it is the place where the practicioner "gathers, blends, and cooks" his or her sexual, vital, and spiritual energies: the first stage in the generation of an immortal spirit being. This is perhaps equivalent to the Western Alchemical "Philosopher's Stone" or "Elixar of Youth".
It may or may not be associated with the central or inner Manipura chakra, and in Tibetan Buddhism this centre is called the Wheel of Emanation.
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