Feynman diagrams: visualization of phenomena and diagrammatic representation

I will argue that the development of Feynman diagrams came from the physicist's capacity of visualizing phenomena and that such visualization-skill contributed to the forming of a narrative explanation in the sense of Wise (2011) and Morgan (2001). The second part of the paper explores the extent to which Feynman diagrams can be considered as weak representations of quantum phenomena. I will review some of the most common arguments in support of the instrumentalist view and I will suggest that a form of weak representation that does not imply ontological commitment can be applied to the diagrams. Such a form of weak representation will be characterized as non-denotative, intentional, and as conveying a physical interpretation through narrative explanations.