I’m not sure if it’s appropriate to think of the structure of Swann’s Way, because it is only the first volume of a seven volume book and it doesn’t seem to make sense necessarily to think of the structure of the volume without knowing first the structure of the book. Still there is something obvious about this that bears remarking on:
That the story of Swann’s love of Odette, which compromises the middle-most and longest portion of the volume, is book-ended or bracketed by accounts of two of the narrator’s personal experiences: in the first instance, encountering the richness of the past through memory; in the second instance, encountering the charmlessness of the present, to which nothing in imagination or memory corresponds.