Field concepts have been imported from physics into psychology and philosophy, in the work of writers such as Kurt Lewin and Maurice Merleu-Ponty. In psychoanalysis, they are found in the work of Harry Stack Sullivan, Enrique Pichon-Rivière, and Willy and Madeleine Baranger. They are essential for relational analysis, where everything than happens in the analytic situation is considered to depend on both parties of the analytic relationship. The analytic situation is understood as a two-person setup, in which neither party can be conceived without the other, because they are inescapably bound and complementary. This is called a “dynamic field,” and it corresponds to an experiential configuration that changes and evolves in time. Insight is better understood as a restructuring of the field, a gradual development of both parties' understanding of their shared unconscious situation. In this paper I discuss the main ideas posed by the Barangers, as well as my own, and present a clinical vignette to illustrate the phenomenology of the field.