Jung’s fundamental insight into the dynamics of the analytic dyad acknowledges that a “third thing” is created between the participants. This presentation will demonstrate how he arrived at this conceptualization using the first several plates of the Rosarium, an alchemical text, from his paper, “The Psychology of the Transference.” We will see how the analyst consciously uses this material arising from the interaction to understand and comment on what may be happening, or trying to happen, in the analysis. The archetype of thirdness becomes essential to understanding the nature of intimate interactions in everyday life.