Oh yes, there is... This
Zorro is arguing that there is value and meaning in the ghetto; graffiti. Just as Nas' raps add value and meaning.
It’s also a way to channel his perspective through Zorro’s line: In the ghetto life doesn’t feel worth living. You’re poor, starving and only way of surviving is hustling and there’s a good chance you’ll die over nothing, like his best friend Ill Will (RIP). What are you even going to do out in the world, your nobody, black and unknown. Nas feels he has one thing to live for/to do in the world outside and that’s to Rap!
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