There are historiated initials throughout the Fabrica, with ‘Putti’ - cherubs or cupids who are engaged in gruesome acts in the name of science. These very innocent looking ‘putti’ perform graphic and violent acts throughout the Fabrica that relate to the process of studying human anatomy.
This historiated initial Q is from the first page of the preface, and shows "putti" vivisecting a pig. While most of the other initials refer to the study of human anatomy, this image may refer to the practices of Galen, whose understanding of human anatomy was formed by dissecting animals.
The paints used by the first owner, German physician Caspar Neefe to colour the illustrations would have been made from the pigments available at the time, such as lapis-lazuli, azurite, malachite, calcite, and umber.
The Fabrica is considered one of the most important medical books ever published, and changed the way that anatomy was understood and taught.