I am reading "Le Petit Prince" and noticed that sometimes, passé composé is used in the description (NOT the dialogue) instead of passé simple. In simple sentences like "J'ai ainsi vécu seul" and "J'ai vu un petit bonhomme tout à fait extraordinaire".
There are instances where you can (or *have to*???) use passé composé in literature? I can't find any pattern so can someone explain this to me?