Can you explain how Chapter 19 uses the analogy of a crystal to describe the Soul's interaction with the world and Maya?

In Chapter 19, it is explained that the Soul appears in this world according to the actions of Maya, the Unmanifest Nature. Although the Soul itself is changeless and pure consciousness, it can seem to be affected by its surroundings. The chapter provides the beautiful analogy of a crystal to clarify this point. Just as a pure, clear crystal appears to take on the color of an object placed near it—be it red, black, or yellow—the Soul may seem tainted by worldly experiences. However, like the crystal, the Soul remains fundamentally distinct from all these colors, staying pure, untainted, and free from change, illustrating how it remains untouched by Maya's illusions.