In the matter of living appearance, my visual body includes a large gap at the level of the head, but biology was there ready to fill that gap, to explain it through the structure of the eyes, to instruct me in what the body really is, showing that I have a retina and a brain like other men and like the corpses which I dissect, and that, in short, the surgeon's instrument could infallibly bring to light in this indeterminate zone of my head the exact replica of plates illustrating the human anatomy.