How does the text explain Sai Baba's imperceptible movements and his ability to rest on a flimsy plank?

Chapter 10 attributes Sai Baba's ability to rest on a flimsy plank and his imperceptible movements to his possession of "Great Siddhis," or divine powers. The text poses the question of how such a narrow plank, tied with mere rags, could support his weight, and answers that the plank was merely for name's sake. It specifically mentions the power of 'Anima,' the ability to become minute. This siddhi allowed Baba's movements to be as subtle and effortless as those of flies, insects, or ants. This is why, as Chapter 10 notes, no one ever knew when he climbed up or descended from his suspended sleeping plank.