How does Chapter 20 explain Sai Baba's fundamental nature and his relationship with his followers?

Chapter 20 presents a profound view of Sai Baba's nature. It states that Sai is 'originally formless' but took on a physical form for the sake of his devotees, comparing him to an actor playing a role. His physical presence is described as a 'Siddhashram,' or an abode of the perfected, where the sight of him relieves the fatigue of worldly life and his constant presence drives away the delusion of existence for those near him. This shows a deep, compassionate relationship where he manifests physically to guide and liberate his followers.