What is the role of Sai's 'Saguna' or physical form in spiritual realization, as detailed in Chapter 52?

Chapter 52 describes the meditation on Sai's 'Saguna' (form with attributes) as a crucial step towards spiritual realization. The text posits that the 'Parabrahma,' or the formless, attributeless Absolute, is 'entirely difficult to understand' on its own. Therefore, the physical form of the Guru serves as an accessible entry point. The chapter advises that by 'meditating immensely on Sai's physical form,' the devotee can begin to perceive the subtle nature of the true Self. As this meditation deepens, the Saguna form eventually 'vanishes' from the mind's eye, revealing the formless light of the Self. In this way, the tangible form mysteriously leads the devotee toward the supreme goal of understanding the intangible.