The mirror is a very important object for the magicians, who use it to create illusions. Eric uses it to transport himself to another dimension! It's not magic ... it's mathematical! Pedagogical side: A mirror reflects everything that is placed in front of it. By placing two mirrors at an angle, we see the objects multiply again and again when we bring them together (and reduce the angle between them); if the mirrors are parallel, there will be an infinite number of reflections!