many people don't know how it's done but i do...
after extensive research on the web, i managed to get some info on how he does this. at the beginning of the trick people can see the statue clear as day through a single window. after a little bit, copperfield closes the curtains. during the time they are closed. the room and everybody in it, actually spins a little bit at an angle, without anybody knowing of course and then stops. this is obviously undetected and must be turned to the precise angle for the audiences view of the window. next, while the curtains are being opened two columns of light are directed at the window. nobody notices this because they are too busy trying to see if the statue actually disapeared. its gone. the reason is because the light reflects into the spectators eyes and with the angle of their view of the window, the statue no longer exists. I heard about there being a helicopter landing on the space where the statue was, it seems like that because the helicopter right next to the statue but from the angle of light it looks different. then he closes the curtains and everything goes back to normal.

for those of you who wont believe me, i understand but i'm just saying, it is true. well most of it, i may have missed a few things here and there but the main outline is correct, please post if you have any questions, thanx!
P.S. to answer your main question, david copperfield is a genius!