According to traditional Javanese kejawen, kris contain all the intrinsic elements of nature: (water), (wind), (fire), (earth, but also interpreted as metal or wood which both come from the earth), and "aku" (lit: "I" or "me", meaning that the kris has a spirit or soul). All these elements are present during the forging of kris. Earth is metal forged by fire being blown by pumped wind, and water to cool down the metal. In Bali, the kris is associated with the nāga or dragon, which also symbolizes irrigation canals, rivers, springs, wells, spouts, waterfalls and rainbows; thus, the wavy blade symbolizes the movement of the serpent. Some kris have the head of a "naga" (dragon) carved near the base with the body and tail following the curves of the blade to the tip. A wavy kris is thus a naga in motion, aggressive and alive; a straight blade is one at rest, its power dormant but ready to come into action.