Generation posed the ultimate challenge for early modern anatomists. Even when they gained access to women’s bodies and fetuses, they had to contend with the ways that generative organs alter with actions and age. Their accounts of these structures focused on variations in shape, size and texture, and on the fluids, eggs and fetuses they contain. Sight was the anatomists primary sense yet, echoing long-standing debates among natural philosophers, anatomists and physicians, they worried about its practical and epistemological limitations. These worries were especially acute when they tried to explain the workings of the generative organs, parents’ contributions and fetal formation. This chapter examines how anatomists produced pictures, developed figurative language and ventured analogies, and argues that these techniques were central to their perception, understanding and communication of things they saw. It takes examples from Andreas Vesalius’ lavishly illustrated volume and William Harvey’s plain text, while situating their arguments about observations, analogies and techniques for producing knowledge within older traditions of studying generation and anatomy. It concludes that in the second part of the seventeenth century, the dissection of animals of all kinds became a technique not only for teaching but also for making discoveries about generation.