This imagery -- both of a ship and of insecurity and simple "wrongness" -- continues when the speaker says in a direct metaphor that "The sky / is a torn sail" (9-10). On a practical level, this is an image of further uselessness and insecurity aboard the "ship" that is this house.

A torn sail cannot provide any guidance or momentum; in essence, the ship that belongs to a torn sail is a dead one. As the houses have already been compared to ships, the "torn sail" of the sky is automatically -- and no doubt intentionally -- associated with the houses that have heretofore been the main subject of the poem. Thus, the night sky fails to provide any further assurance of security or comfort to the dead ships that are the houses.

Furthermore, the image of a ship with a torn sail is simply spooky -- it reminds...
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