Visual epistemology “refers to ways of knowing that are presented and processed visually,” explained by Drucker (7). She notes that for the purpose of this book she will focus on representation and not cognition. She further explains that while “visual expressions of knowledge” are necessary for science disciplines, language-oriented disciplines have only scratched the surface (7).
Language of form “suggests a systematic approach to graphic expression as a means as well as an object of study,” described by Drucker (8). She goes on to state, “Most information visualizations are acts of interpretation masquerading as presentation. In other words, they are images that act as if they are just showing what is, but in actuality, they are arguments made in graphical form” (9).