I think some people are more visual or aware of surroundings more in general than I am. I very likely would not notice if something was taken off my wall at home, let alone at the therapist's.
I notice whether I can see the clock on the table or not. If not - I take off my watch and put it on my knee. I never, ever touch any of the therapist's stuff. I dislike it when I have to move a pillow on the couch. I do wish the one had chairs instead of her awful awful sofa.