Wittgenstein was intrigued by the idea of experiments where subjects see their own body through mirror or screen, and move their body relying solely on that visual information. But it is not so clear why such experiments are so important and what they are supposed to show. In this paper I argue that such experiments reveal our naive conception of the relation between intention and body, which is based on two specific models; namely, criticize both of them, and draw some alternative pictures.