Inspiring himself from La Philosophie dans le boudoir by Sade and the major philosophical works of the 18th century, Alain Prochiantz, who is a neurobiologist, explains by means of a dialogue, the progress of embryology and neurobiology and gives us the elements so that we can understand and measure the stakes of the recent discovery of the genes of development.

Alain Prochiantz heads the Laboratory for the Development and Evolution of the Nervous System at the École normale supérieure. He is notably the author of Strategies of the Embryo, and Claude Bernard, the Physiological Revolution.