I know this sounds like a cliché, but it really is true, when you find out how they really do the magic trick it is a let down, for you see how sneaky and deceptive they were, giving false appearances. Seems unethical to me in a way. Like when Copperfield takes a blanket he is holding up and you can see his his face and shoulders then he lets go of the blanked and someone else appears in his place holding up the blanket. This is simply done by the other person crawling up under his legs to stand in front of him, then Copperfield lets go of the blanket, the other person grabs it and Copperfield jumps back down behind the platform. Most of those disappearing and reappearing tricks are based on making you think there is nothing going on behind platform they are standing on and that it is clear underneath the table. In actuality, Copperfield is crouched down behind the table. They create an illusion with lighting or mirrors or a painting to make it seem like there is nothing underneath or behind the table. The common theme is they are always crawling around behind the scene, and there is an entrance to the empty compartment. There is a trap door or a way to come in from behind. It's funny the videos that show this. It's embarrassing how simple it is, you wonder why you didn't realize it in the first place.