The main point of this article is the recognition that the patient doesn't create a field only with the analyst, but also with other important people, with his work place, and with some Self-Objects. The analyst may perceive how the patient's moods, feelings, and self-esteem change when entering each of these different fields. The analytic field created between the analyst and the patient is an important tool, a sort of Geiger counter, through which the analyst may detect the presence and the activity of these other fields. Isabel's brief case history illustrates a useful approach to deal with the negative effects of a very disturbing and confusing field she established with the company she worked for.