Can you explain the significance of the wooden plank Sai Baba slept on as described in Chapter 10?

Chapter 10 provides a fascinating account of Sai Baba's sleeping arrangements, which demonstrated His divine powers. He would rest on a very narrow wooden plank, just four cubits long and one span wide, suspended from the rafters by old rags. The text from this chapter highlights the miraculous nature of this act, questioning how such a flimsy setup could support His weight. It concludes that the plank was merely for show, as Baba possessed great Siddhis (powers). His movements onto and off the plank were imperceptible, suggesting his complete mastery over the physical form.