On this there is this Sloka: `There is a cup having its mouth below and its bottom above. Manifold glory has been placed into it. On its lip sit the seven Rishis, the tongue as the eighth communicates with Brahman.' What is called the cup having its mouth below and its bottom above is this head, for its mouth (the mouth) is below, its bottom (the skull) is above. When it is said that manifold glory has been placed into it, the senses verily are manifold glory, and he therefore means the senses. When he says that the seven Rishis sit on its lip, the Rishis are verily the (active) senses, and he means the senses. And when he says that the tongue as the eighth communicates with Brahman, it is because the tongue, as the eighth, does communicate with Brahman.