On display will be an architectural sketch depicting a floor plan for an unrealized chapel (right). It was only through the use of infrared reflectography in the mid-1990s that the sketch, located on the reverse side of a study of profile heads (below) that had been tentatively associated with the artist, was confirmed as the work of Michelangelo. Michelangelo, Bust of a Youth and Character Head of an Old Man, 1520s. Black chalk on tan laid paper. Gift of Frank Jewett Mather Jr. (Photos courtesy of the Princeton University Art Museum)