Can you describe the strange plank Baba slept on and why it was so unusual?

Chapter 10 details Sai Baba's peculiar 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 with old rags, like a swing. What made this so unusual, as highlighted in the chapter, was not just the precariousness of the setup, but the fact that his movements onto and off this plank were completely imperceptible. The text questions how such a flimsy structure could support his weight, concluding that it was possible only due to his Great Siddhis (powers), with the plank being a prop "for name’s sake."