Birdwings

Sorrow is like a mirror before the scholar, where in this opposite, the face of the opposite is shown.  
After the opposite, the pain of that other opposite appears, meaning expansion and grandeur.  
See these two attributes from the palm of your hand; after the fist is clenched, the opening surely comes.  
If the palm is always clenched or always open, it becomes afflicted.  
From these two attributes, work and livelihood are organized, like a bird's wing, these two states are important to it.