Tracking information over time, but it depends on what type of graph you are referring to
Answer: The narrator is not entirely truthful.
In this excerpt, the narrator is describing the reasons why he has decided to stay in Venice longer. He explains how he persuaded his friends, and almost persuaded himself, that the reason for his long stay was the deisre to study Venetian culture. However, he implies that there are hidden motives for it, indicating that the author is not being entirely truthful.
Metaphor or possibly personification
