There is a secret about that bed which no one knows but you and I and a single servant. I built our bed myself around a living olive tree.
After twenty years apart, Penelope will not simply accept that the stranger is her husband. She devises one final test: she tells a servant to move the bed from their chamber. Odysseus protests — that bed cannot be moved, because he built it around the trunk of a living olive tree. Only the real Odysseus would know this.
The great recognition scene: Penelope tests Odysseus by saying the bed has been moved. His angry knowledge of the unmovable olive-tree bed proves his identity. The bed is home itself — rooted, immovable, alive.