Question: The 16th-century polychrome rood beam spanning the nave is decorated with 12 prophetesses (on the chancel side) and scenes from the Passion.
The polychrome rood beam was manually decorated with scenes from the Passion.

Answer: it is not possible to tell

Question: Adjacent to the church is the Laurentian Library (Biblioteca Laurenziana), commissioned in 1524 and most known for the graceful cloisters and monumental Michelangelo-designed stairway.
The Laurentian Library has a stairway that was designed by Michelangelo.

Answer: yes

Question: Mrs. Inglethorp, however, seemed to notice nothing unusual.
Mrs. Inglethorp, however, did not notice the changes in the room's setting.

Answer:
it is not possible to tell