 As just seen, it is generally assumed that vision, and other external senses, do not guarantee bodily IEM. Ernst Mach famously reported stepping onto a bus and noticing a man who looked like a shabby pedagogue. In fact, he was seeing himself in a large mirror at the far end of the bus (Mach 1914). Conversely, if we see a broken arm, we can mistake it for our own, although it is another person’s arm that is mixed up with ours (Wittgenstein 1958). On the basis of such examples, it is said that no judgement based on external senses is immune to error through misidentification. There is a gap between visually knowing that a body is F and visually knowing that it is my own body that is F. Consequently, when people discuss bodily awareness, they rarely mean the visual awareness one can have of one’s body.