A barren woman's son boarded two ships. These ships were filled with spices made from sky-flowers.

This couplet paints a vivid picture of impossibility. It speaks of a 'son of a barren woman,' which is inherently contradictory, as a barren woman cannot have a son. This impossible son then 'boarded two ships,' implying a journey that cannot even begin. To top it off, he 'filled them with sky flowers,' a beautiful but non-existent concept. 'Sky flowers' are purely imaginary, like a lotus blooming in the sky, meaning they have no reality. The verse uses these absurd images to describe something utterly non-existent, like an illusion. It's a poetic way to highlight things that are conceptually impossible or cannot ever happen.