How does Chapter 8 describe the physical body's nature and impermanence?

In Chapter 8, the physical body is described in a very stark and transient manner. The text uses the analogy of a lamp's flame, which appears constant but is actually different every moment, to illustrate the body's continuous state of change. It notes that 'what is seen one moment perishes the next.' The chapter further emphasizes the body's impurity, calling it a 'washroom of excrement and urine, a foul place of phlegm, pus, and saliva.' This graphic description serves to highlight the body's temporary and unclean nature, reminding the reader that 'death is placed at every moment,' which is framed as a great misfortune.