In Chinese philosophy, metal or gold is one of the five concepts that form the wuxing. It is the return or the declining stage, and is associated with the Western direction, dusk, autumn, loss, grief, the later years of life and the White Tiger. In Traditional Chinese Medicine, Metal is the young yin symbol of Yinyang philosophy, its motion is going inwards and its energy is contracting. It is related to the Zung solid organ the lungs, and the fu or hollow organ the large intestine, Its energy has governance over the respiratory system including the noses, and the skin. The archetypal metals are silver or gold denoting something of selfworth, special or valuable.