Making sure my punctuation curve, every letter here's true
Living my life in the margin and that metaphor was proof

from Kendrick Lamar (Ft. Drake) – Poetic Justice Lyrics on Rap Genius

Meaning

Kendrick poetically justifies why his writing is vital to hip-hop. To explain this, he sneaks 4 literary mechanisms into the inner-workings of his rhymes (punctuation, letter, margin, metaphor):

The genius of that metaphor proves his dedication to his craft and proves his raps are beyond average.

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