Chapter 10 mentions Baba's movements were 'imperceptible.' What does this refer to, and how does the chapter explain it?

In Chapter 10, the phrase "imperceptible movements" specifically refers to how Sai Baba would get onto and off the narrow wooden plank he slept on, which was suspended from the ceiling. The text highlights that despite him sleeping there, "when He climbed up or down, no one ever knew." The chapter attributes this mystery to Baba's divine powers, or Siddhis. It posits that the plank's ability to support his weight was merely nominal and that his mastery of powers like 'Anima,' the ability to become minute, allowed him to move with the ease of flies, insects, or ants, completely unnoticed by others.