Replicating spheres

The magician shows one ball and in a second he multiplies it and shows two balls.
Then he makes the balls sway between his fingers until he shows three balls. After appearance and splitting, the magician ends the performance showing proudly four balls at his fingertips. Adding an extra touch of class to the performance, the magician, one by one, makes the balls vanish.
Smiling and proud of himself, he will receive the deserved applause when he shows only one ball as at the beginning.