 The three Cinnabar Fields (dantian) are the lower Cinnabar Field (the dantian proper), which is found in the region of the abdomen and is the seat of the Essence (jing); the middle Cinnabar Field, which is found in the region of the heart and is the seat of Breath (qi); and the upper Cinnabar Field, which is found in the region of the brain and is the seat of Spirit (shen). In meditation practices, the three Fields are the residences of the Three Ones (Sanyi), who represent the One and its subdivision into the Two. In Neidan (Internal Alchemy, on which see  §10.3),  they are the loci of the conception, nourishment, and delivery of the alchemical embryo.