Wing of wax? Or wing of gold leaf? Choose one
Float or plummet 20,000 cold leagues
from Aesop Rock – Garbage Lyrics on Rap Genius
Meaning
A reference to Icurus who along with his dad fashioned a pair of wax wings, but alas flew to close to the sun and his wings melted allowing him to fall to his death

It is meant as a lesson on failed ambition, but the line talks about our desire for money as well. Just as a following your dreams will allow you to float your ambition could be your downfall.
- Gold leaf wings (not following your dreams instead chasing money) could be seen as guaranteed to make you fall and sink.
alternatively
- The gold leaf wings float and are the wings of the rich they can go as high as they like. The wax wings on the other hand melt; the poor are limited in their ambitions.
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