"The exhibit is a science workshop," Delieuvin said. "For Leonardo, art is founded on theoretical knowledge of nature and its functioning."
The real da Vinci code: Louvre unlocks last work →
Louvre curator Vincent Delieuvin says that toward the end of his life, Raphael paid homage to the "dark, tense and expressive" style of Leonardo.
Louvre reveals dark faces of Old Master Raphael →