Can you explain the significance of the wooden plank described in Chapter 10 and what it reveals about Sai Baba's nature?

Chapter 10 details a mysterious and significant aspect of Sai Baba's life: his sleeping arrangement on a narrow wooden plank. This plank, only four cubits long and a span wide, was suspended from the rafters with old rags. Baba would sleep on it, yet no one ever saw him get on or off. The text explains that this seemingly impossible feat was a display of his divine powers (Siddhis), and the plank was 'merely for name’s sake.' This illustrates that Baba was not bound by physical laws. It points to his true nature as being beyond his physical form, the 'dweller in all hearts' who was internally unattached despite his external engagement with devotees.