How does Chapter 10 explain the mysterious and imperceptible nature of Sai Baba's movements, particularly in relation to his sleeping plank?

Chapter 10 emphasizes the mysterious quality of Sai Baba's presence. It states that while he slept on a narrow plank suspended from the rafters, no one ever knew when he climbed up or when he descended. His movements were described as 'imperceptible.' The text attributes this to his great Siddhis, or divine powers, suggesting the plank was merely a prop. It further explains that Baba's movements could be as subtle and unnoticed as those of flies, insects, or ants, highlighting his ability to transcend ordinary physical limitations.