The Song of the Wandering Aengus
The Song of the Wandering Aengus was a  19th and 20th century Earth poem by William Butler Yeats. The poem describes a man going into the woods, after which he catches a fish which turns into a beautiful woman with apple blossoms in her hair. She calls his name and then vanishes, and he spends the rest of his life searching for her, his vision of perfection.

Sally Archer used to recite the poem to her son, Jonathan Archer, whenever he had trouble sleeping. He thought it had a funny name.

As a child, Archer created an image in his mind of the woman from the poem. Whilst on a rogue planet, a wraith transformed itself into the woman Archer had imagined and communicated with him. ()

Excerpt
I went out to the hazel wood,
Because a fire was in my head

External link
 

fr:The Song of the Wandering Aengus
Earth literature