Can you describe the plank Sai Baba slept on and explain why it was considered so remarkable?

Chapter 10 describes the plank in specific detail. It was a simple wooden plank, four cubits in length but only a single span (approximately 9 inches) in width. This narrow plank was hung from the ceiling rafters, tied at both ends with old rags, functioning like a swing. The remarkable aspect was twofold. Firstly, no one could comprehend how such a narrow and precariously hung plank could support Baba’s weight. Secondly, his movements onto and off the plank were imperceptible, adding to the mystery. The chapter concludes that this was not a feat of physical balance but a display of his great Siddhis (powers), and the plank was merely a support "for name’s sake."