Rushdie has a lot to say about adaptations.  

In a nutshell:

an adaptation works best when it is a genuine transaction between the old and the new, carried out by persons who understand and care for both, who can help the thing adapted to leap the gulf and shine again in a different light. 

But it takes a while to get there. And once he gets there, he keeps going all the way to problems of social and cultural adaptation.

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