The correct answer is that these lines talk about the immortality of art.
Ode on a Grecian Urn by John Keats is often interpreted as the celebration of art and its immortality. The figures depicted on the urn have passed long before the narrator examines the urn on which their lives were depicted. Even though they perished their story has been preserved on the urn, and in a sense they have become immortal through the art, which is that which remains long after we are gone.
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IThe metaphor affects the meaning in the sense that it is not at all helping the other features in showing positive emotions. In this case the feelings are not so positive. the author says that the moon is quiet, dark and it is tattoo on the sea. The author is showing that moon is acting differently. The moon becomes the spoiler of the scene.