How was it possible for Sai Baba to sleep on a narrow, suspended plank, and what did people observe about his movements?

Chapter 10 explains that while it seemed physically impossible, Sai Baba's ability to sleep on a narrow plank hung by rags was a display of his divine powers, or Siddhis. The text states that the plank was merely for name's sake, as his great powers resided within him. His movements were completely imperceptible; no one ever witnessed when he climbed up to the plank or when he descended. This mysterious nature is further explained in Chapter 10 by noting that with the power of 'Anima' (to become minute), his movements could be as subtle and easy as those of flies, insects, or ants.