DE HUMANI CORPORIS FABRICA LIBRI SEPTEM, 2nd EDITION, 1555
Portrait of Vesalius as a self-confident anatomist at the age of only 28 years.
Vesalius shows the result of his work using the dissection of a right arm. In doing so, he distances himself from earlier representations which showed anatomists as teachers from books while assistants dissected the corpse. He recognizes the importance of unbiased observation which can only be implemented by one's own careful dissecting.
Vesalius was the first to require the autopsy, which translates from the Greek language roughly as "to see with one's own eyes".