Intertextuality

"Immature poets imitate; mature poets steal; bad poets deface what they take, and good poets make it into something better, or at least something different.  The good poet welds his theft into a whole of feeling which is unique, utterly different from that which it is torn; the bad poet throws it into something which has no cohesion.  A good poet will usually borrow from authors remote in time, or alien in language, or diverse in interest."  -TS Eliot