While the average illusion takes about 2 years for Copperfield to perfect, "Flying" took 7 years because of the difficulties that had to be overcome. It is truly magic in its performance. Many magician's "tricks" are quite simple, but totally lose their wonder if they are revealed. We are therefore sworn to silence, so that generation after generation can enjoy the experience.
I must admit that I like to believe in the true magic of it. It must be my inner child. :-)