The Satcharitra says Sai is formless. Can you explain what this means and why he took a form according to Chapter 20?

According to Chapter 20 of the Shri Sai Satcharitra, Sai Baba is described as being originally formless. However, for the benefit and sake of his devotees, he took on a physical form. The text uses a beautiful analogy, stating that he accepted the role of the actress "Maya" and played his part like a true actor. This was done so that his followers could have a tangible presence to connect with. The chapter further elaborates that the sight of this form is enough to relieve the fatigue of worldly life and drive away the delusion of existence for those who are close to him, highlighting the purpose behind his manifestation.