Floating peacefully in the womb, a tiny fetus flexes its fingers and sucks its thumb. Breathing amniotic fluid into its lungs, it makes a strange, hypnotic sound. Now, the photographer who led us into this awe-inspiring world of the womb has agreed to take us behind the scenes of his own work. For decades, this unparalleled photographer has astonished the world with images that make visible the mysteries of life.