It is said that Shen is the manifestation of spirit and is seen as the light in the eyes and the glow from the skin. You will see it in many who meditate and are at peace with themselves and those with a child like energy.

I have been with a man who was sleep deprived and hungover and as soon as he started talking about his passion I saw his eyes light up, like a light switch was turned on.

Significant shen examples from Face Reading in Chinese Medicine by Lillian Bridges