Can you describe the unusual plank Sai Baba slept on and explain how it was possible for him to use it?

Chapter 10 provides specific details about Sai Baba's sleeping arrangement. He slept on a wooden plank that was merely four cubits long and one span (about 9 inches) wide. This narrow plank was suspended from the rafters of the mosque, hung like a swing by old rags tied to its ends. The text notes that Baba's movements onto and off this precarious bed were imperceptible to anyone. The chapter explains this was not a feat of physical balance but a display of his Great Siddhis (powers). The plank itself was said to be for "name's sake," as his powers, such as 'Anima' (the ability to become minute), allowed him to move with the ease of an insect.