A close-up of the tiny ear-bones of a few kinds of animals, including human beings.
This is a detail of a page from Musurgia Universalis, which was the book of the month at the Glasgow University Library Special Collections Department for November 2002. A few centuries earlier, in 1650, it was a groundbreaking work by the Jesuit polymath, Father Athanasius Kircher.
He liked music, and was very, very curious about how listening happened.