How does Chapter 19 explain the concept of Maya and the true nature of the Soul using the crystal analogy?

In Chapter 19, the Soul is described as changeless, self-luminous, and pure consciousness, distinct from the body, senses, and mind. However, it appears in the world according to the actions of Maya, which is the Unmanifest Nature. To clarify this, the chapter uses the analogy of a crystal: just as a pure crystal appears to take on the red, black, or yellow color of an object placed near it, the Soul appears affected by the world but remains internally untainted and distinct from all colors and changes. This illustrates how the ego of 'I am the body' is a false superimposition, much like mistaking a rope for a snake.