Alan Rickman talks about making the Harry Potter series. Did you research on magic at all? No, not really. So much of that magic is computer graphics and that is magic. We watched over the 10 years of filming. By the end, we were just on a pile of grass at the back of the sounds. Didn't have to go anywhere. Just stand there and the day will come where they don't even need you. They just digitize you and we've got you.