The concept of therapeutic persons as “transitional subjects” has been denoted and described primarily by Benedetti. When the intersubjective dimension of providing patients with self-object experiences is supplemented by a very specific personal commitment on the part of the therapist, the constitution of a transitional subject can take place. Transitional subjects can be envisioned as “euconstructions” or euconstructive personal transactions, which facilitate patients to enter new territories of experience. Clinical examples are cited where these piloting phenomena emerge. Transitional subjects are based on therapeutic self-object experiences, go a step further, and try to enable novel movements, for example in the area of the capacity to mourn. New psychic possibilities assist efforts to integrate disparate psychic parts and to develop new choices. Various options to comprehend the phenomena of transitional subjects are presented.