Avicenna divides temperaments into moderate and immoderate. Temperament consists of the following elements, war, clod, dry and wet. Based on traditional medicine, temperament is reported to be the interaction between these four elements such as the conflict between dryness, wetness, cold and heat. Interestingly, these elements are represented by colors like red, blue, black and yellow. Avicenna suggests that these qualities battle each other until a state of equilibrium is achieved and this state is known as the temperament. He describes a hot versus cold, Moist versus dry equilibrium between the organ of human body. The heart, for example is hot and must be in equilibrium with the other cold organs such as the brain. When equilibrium is achieved between these organs, the person is considered to be in ideal equability.