If a person uses their intellect, they can see many different shades of color on the face. Among these, the most noticeable are the color of the eyes and the flow of the senses. Although the eyes are also part of the senses, they are more strongly affected by what they observe externally. Many external images, through the eyes, influence the inner mind.
This influence causes the senses to either become refreshed or dull, weak or strong. The state of the mind depends on these changes. Gradually, this function of the mind seeps into the nerves, which may then act correctly or incorrectly.
The waves of the mind leave so many effects on the face that it becomes difficult to read them all. Yet, a kind of film continues to play on the face, showing the impressions that have been transmitted to the nerves.
As mentioned before, the number of colors is great, and their usefulness is immense.