The text mentions a plank Baba slept on. Can you describe this plank and how Baba used it?

Chapter 10 describes Baba's unusual sleeping arrangements. He slept on a wooden plank that was four cubits long but only one span, or about nine inches, wide. This narrow plank was suspended from the rafters like a swing, tied at both ends with old rags. Baba would sleep on this precarious setup with lamps burning at his head and feet. The text emphasizes that his movements were imperceptible; no one ever saw him get on or off the plank, highlighting his extraordinary nature and Siddhis (powers).