13 petites enveloppes bleues (Broché)

They seemed to represent a deeper journey of self-discovery for the protagonist. What do you think the envelopes symbolize in the bigger picture?

Her descriptions brought the places to life, but I wonder how much was based on real experiences or research. Did anyone else feel transported?

The number feels intentional, almost like a rune or a symbolic count. I'm curious whether this was a storytelling decision or tied to the character's personal growth.