Chapter 22 mentions the 'logic of the branch and the moon.' What does this mean in the context of seeing Sai Baba?

In Chapter 22, the 'logic of the branch and the moon' is used as an analogy to explain how devotees approach the divine vision of Sai Baba. Just as one might use a nearby tree branch to help locate the distant moon in the sky, devotees grasp Baba's big toe to fulfill their curiosity for a divine vision. The text from Chapter 22 suggests that focusing on the tangible and accessible form of the Guru's feet allows the devotee to experience the vaster, more subtle divine reality. This act of placing their heads at His feet is described as a way for devotees to 'plunder personal happiness with love.'