The document discusses classification, which is the process of recognizing, differentiating, and understanding ideas and objects. It provides examples of various artworks and their titles including "Pornographic Drawings" and "The Physical Impossibility of Death in the Mind of Someone Living". The document emphasizes that titles are important for distinguishing works, making them easier to find, discuss, and reference. Intriguing titles can provoke contemplation in viewers and provide context and guidance for interpreting works.