Lines of thought describes the role of visual representations of invisible structures (definition, elements, cognition processes) in medieval texts in the Artes Faculty. By exploring three case... Show moreLines of thought describes the role of visual representations of invisible structures (definition, elements, cognition processes) in medieval texts in the Artes Faculty. By exploring three case studies in the field of logic, natural philosophy and medicine/psychology, the author investigated how medieval diagrams in learned texts were used and valued. She concentrated on scholarly activity in Paris, Oxford and Prague, 1200-1500. Show less