\”In & out\” is undoubtedly one of the most amazing automatic effects … The magician has a red box in which is a smaller black box. The latter is open, it contains a red sponge ball. So far everything seems normal except that now the magician puts the red box in the black box. They are open again and a black foam ball is extracted from the red box. The magician reiterates the operation by placing the black box in the red box. And when it opens the boxes again, a new foam ball is extracted from the last box! Of course boxes and foam balls can be given on the exam. – Totally automatic– Everything is provided: the three foam balls and the two boxes.