What an amazingly evolved person! Ha! That's such a great way of putting it! My feelings exactly!

Anytime you take an existing story and rework it: fanfic! The differentiation he is making is between amateur and professional fanfic, I suppose. Definitely on both counts. Add to your list things like, say, Wide Sargasso Sea or Paradise Lost, which are both high literature, and you've got some serious writing going on.