JK Rowling

“Fantastic Beasts is giving me this opportunity to explore all of that and reveal things that I’ve had in my mind for a long time. So that’s enormously satisfying, but I’m inventing too. So, it’s taking all of the things that I thought happened and putting them under a microscope and thinking well, ‘how would that work?’, and then that gives you an opportunity for more inventions, so it feels very fresh and interesting to me.”

Source: YouTube