Can you explain the analogy of the lamp flame used in Chapter 8 to describe the nature of the human body?

In Chapter 8, the human body's nature is compared to the flame of a lamp to illustrate its constant state of flux and impermanence. The text explains that just as a lamp's flame appears to be the same from beginning to end but is actually different every single moment, the human body also undergoes continuous, imperceptible change. What is seen one moment perishes in the next. This metaphor, as presented in Chapter 8, emphasizes that although the body seems singular and constant through stages like childhood, youth, and old age, it is actually in a perpetual state of transformation, highlighting its transient and unreliable nature.