02/20/2013 05:52 pm ET Updated Dec 06, 2017

82nd & Fifth: THINKING ALOUD by Carmen Bambach

Did you know that a boy, a model in Michelangelo's studio, posed for this study, which was to depict a female, the figure of the Libyan Sibyl? To curator Carmen Bambach, the boy's personality is captured in this drawing. "I can see the humanity in a way, the figure breathing," she says.

Compare Michelangelo's Libyan Sibyl study with his final figure on the ceiling of the Sistine Chapel.