Sara is a friend from the semester you spent in San Francisco. She will be graduating from the San Francisco Art Institute this semester. For about a year you and Sara maintained a fairly constant exchange of mail art-stuff, mostly random tidbits, and found objects; you would send her all of your test-strips from printing in the darkroom, and she would send you these wonderful Polaroids, and contact prints.
Your contact with Sara is primarily via e-mail. You mostly keep each other up to date on your situations, your projects, etc. Your emails are fairly matter-of-fact.