The magician starts his act by taking a bite out of an apple. He then delivers some patter, and shows what apparently is the bite he had taken. After some more patter, he shows that what was thought to have been the bite that he was showing was really just a sticker with a picture of a bite, which he proceeded to peel off, leaving an apparently pristine apple.
He walks across the stage and places this apple on a pedestal on a table. He then proceeds to do a few more tricks in his act. Finally he walks over to that apple, showing that the bite has reappeared. He takes the apple off its pedestal and hands it to someone to evaluate that it is indeed a real bite taken out of the apple.
How was it done?