What is the "logic of the branch and the moon" mentioned in Chapter 22, and how does it relate to seeing Baba's feet?

Chapter 22 uses the analogy of the "logic of the branch and the moon" to describe how devotees could perceive the divine through Sai Baba's feet. Just as a person might use a branch or a gap between branches to help locate the small crescent moon in the vast sky, devotees found a similar divine vision at Baba's feet. The chapter details how when Baba sat with his right foot over his left knee, the nail on his big toe would shine "like the second day's moon." This sight at his feet fulfilled the devotees' intense curiosity and longing for a divine vision, making the intangible divinity accessible and visible through a tangible form.