How does Chapter 20 explain Sai Baba's fundamental nature and his appearance in a physical form?

Chapter 20 explains that Sai Baba is, in his original state, formless. However, for the sake of his devotees, he took on a physical form, accepting the role of "Maya" much like an actor plays a part on stage. This chapter describes him as a "Siddhashram," or an abode of the perfected, whose mere sight relieves the fatigue of worldly life and whose constant presence can drive away the delusion of existence for those close to him. This illustrates that his physical manifestation was an act of grace to help his followers navigate their spiritual and worldly paths.