Does anyone know an Italian equivilent for the English expression 'textbook example' - used to mean something that is almost the very definition of itsel? For example: "This is a textbook example of a hamburger" (i.e. this burger is round, in a bun with sesame seeds, with ketchup...etc.) or "He's a textbook example of how not to drive a car" (i.e. this person is so bad at driving that he seems like a carciture used in training manuals to show learners what not to do). Thanks to you all!