I think that we're all born magical in that when we're kids we think anything is possible and we believe in magic. As life happens we become less and less magical, depending on our culture, religion, education, etc. There are a handful of us who, for a number of reasons, want to make magic happen and want to keep the magic alive. But in order to do that we need to stop believing that magic is the ability to do the impossible, but it is that experience when we come face to face with mystery.
So - we train ourselves to make it look as if we're doing the impossible in order to create a magical experience for us and our audience.
I think that deep down, though, most magicians yearn for magic to be real and to be able to do the impossible, and that is why we keep on learning, training and buying those new gimmicks and props and dvd's that subconciously promise this to us.
So I guess it's both: nature, cos when you think of it life is really a miracle and full of mystery;
and nurture in that you need to work really hard to remind people of that
