I'm always wondering: Have all these time-saving devices actually saved us any time, or have they just created a million fetishes and obsessions that keep us from the quiet half hour we should be taking to sit and do nothing every day?
But things such as 'Harry Potter', all I can do is shape my character, seek the director's approval on that, and basically take it from there. Professor Flitwick in 'Harry Potter', I kind of defined how I saw him from reading the book, and luckily that matched up with the director's vision.

