I don't put a girl in a box and clap my hands three times, and she's gone. I get in the box, and I vanish, and I reappear at the other side of the stage. That way, people don't think, 'That's a great illusion.' They think, 'Doug's a great magician.'
Wonder is very necessary in life. When we're little kids, we're filled with wonder for the world - it's fascinating and miraculous. A lot of people lose that. They become cynical and jaded, especially in modern day society. Magic renews that wonder.
Now there was no wonder in the Statue of Liberty illusion because he, Copperfield, attempted to do something so large that it stretched the credibility of the audience to the point where most people didn't believe any of it anymore.