Editor’s Note: The December 2005 issue of Structural Integration contained three articles on “biodynamics” written by Rolfers. Subsequent to that, an exchange of Letters to the Editor appeared wherein it was clarified that the word “Biodynamic” is used in different contexts by Franklyn Sills (with whom many Rolfers have studied “Biodynamic Craniosacral Therapy”), by Jim Jealous, D.O. (who teaches osteopaths the “Biodynamic” model as it applies to Osteopathy in the Cranial Field), and by Dr. Erich Blechschmidt, an embryologist. As the term “biodynamics” is not service-marked, and as the paradigm is of interest to Rolfers, Structural Integration will continue to publish articles on the topic, but ask authors to identify the basis of their use of the term.The basis for all body form is embryology. In understanding embryology, we understand how the adult structure came to be. Embryology does not stop at birth,? we have the potential for change all along. In a sense, we are embryos throughout our lifetime.1.