The text says Baba's movements were 'imperceptible.' What does Chapter 10 explain about this and his other divine abilities?

Chapter 10 of the Shri Sai Satcharitra delves into Sai Baba's mysterious abilities, noting that his movements were often "imperceptible." This is exemplified by the way he would get on and off the narrow wooden plank he slept on, a feat no one ever witnessed. The chapter explains that such actions were possible because of his Great Siddhis, or divine powers. Specifically, Chapter 10 mentions the power of 'Anima,' the ability to become minute. It suggests that Baba could easily move in the forms of flies, insects, or ants, which explains how his comings and goings could be so subtle and unnoticeable to others.