Wood grows upwards, enduring. Fire spreads in all directions, radiant and hot. Triangular, red, orange, purple and pink. Metal pierces inwards, sharp and pointing. Spherical, white, golden and silver.
Earth attracts and concentrates, stable.
Cubical, brown and yellow. With the understanding of Wu Xing, Yin and Yang concepts, the medical Wu Xing were developed in Traditional Chinese Medicine connecting the human organs and viscera with both concepts according to the organ or system's function and position. Wood Yin Wood is Liver, Yang Wood is Gall bladder. Fire Yin Fire is Heart, Yang Fire is Small intestine. Earth Yin Earth is Spleen, Yang Earth is Stomach.