There's an old saying by one Mr Picasso that fits this nicely. It's often mistakenly attributed to one Mr Jobs an awful lot too...
That one?
It really doesn't matter where the quote came from. Even when put into proper context (which has rarely happened in the past) the logic behind it is shaky.
Great artists do imitate, as students they copy the techniques and methods of those who came before them, in order to learn and master the skills they will need to make their own art. When they are ready, the truly great artists then proceed to create things that we've never seen before.
I've always assumed that this is what the quote is referencing rather than taking actual elements in full as is the case in a few of these examples.