What a great idea for a thread, SAWE! What I look at first in any T's office is her books!!! Yeah, you might say I'm a bookish person. I asked my former T if I could look at her books because they were behind her chair, inaccessible to me. She said okay, though I felt a little awkward.
My current T has books on the window sill and the bear I gave her is the bookend! She also has a bookcase in the back of the room. I don't really have time to look, though. The few times before the session when she has left the room, I look. I like her collection though I can't remember any titles offhand except for the EMDR and IFS books.

I thought she was more of a reader than she is, which disappoints me. She has my "One Child" and said maybe she'll read it when she has time (I like that she has it even if she never reads it). She never read In Session that I gave to her, and I had to pay 25 cents overdue for it, which I never told her about.

The waiting room which is shared with other Ts has another bookshelf. Those are interesting and have more sex books than in her office, I noticed. I asked in an email if I could borrow any of those books and she told me "yes", because she trusts me to return them. She also lent me the Yalom book, the novel I hated. I told her it wasn't worth reading! I told her that his Staring at the Sun was good, and she bought it but I don't think she ever finished it. If I worked long hours as a T and had a house to take care of too, I probably wouldn't read so much either. She did tell me some books she was reading, about meditation and yoga.

My T doesn't stand on ceremony about anything; she's just a regular Mom who decided to become a T. Why not ask to borrow her books?