Two people stand opposite each other, on their heads are helmets with screens in which a camera is built-in. The camera broadcasts an image of one person on the screen of another and vice versa, i.e. both of them see their own body through the eyes of a third person placed at the same point as the other person. If you touch both at the same time, they will perceive the sensation as having arisen in someone else’s body. For an illusion to occur, bottom-up perceptual mechanisms, such as visual information, must prevail over the top-down knowledge that a certain body (or part of it) belongs to another person.