Page #11 shows the well-known symbol of medicine science calls Caduceus. The symbol has its own long history starting in the Greek mythology. Asclepius is the Greek demigod of medicine. The snakes were considered as sacred and used in healing rituals to honor Asclepius, as snake venom was thought to be remedial and their skin-shedding was viewed as a symbol of rebirth and renewal. In my graphic, you can see the inverted Caduceus as an interpretation of the protagonist's character, Professor Schilling.