. >> rose: who was baroccio? his teacher. when leonardo was young, maybe 12 years old, he gets apprenticed to baroccio's studio who was one of four or five sort of studios in florence that were becoming very successful because everyone needed to adorn their new balances with madonnas and showed they were faithful and had good taste, but baraccio was part of the crowd they would just turn it out. but leonardo, the 12 or 13-year-old comes and changes the way they do things, so he becomes a painter and poses for so they know what he looked like as a kid. >> rose: was he a late bloomer? >> he stays as an apprentice to baraccio for a long time. after his apprenticeship should have ended. he's turning out a few madonnas. we're not sure which ones are fully his or by other people in the studio, but you watch as he paints, for example, the baptism of christ, and veraccio does some of the main characters, but leonardo does the river flowing in and the water flowing over the body and then the water of the river jordan rippling at the a