In speaking of the Sistine I have treated Michael Angelo as a sculptor, and it was a sculptor who designed those frescoes. Nè io pittore is his own phrase. Compare an autotype of "Adam" in the Sistine with one of "Twilight" in S. Lorenzo: it is clear that in the former Michael Angelo painted what he would have been well pleased to carve. A sculptor's genius was needed for the modelling of those many figures; it was, moreover, not a painter's part to deal thus drily with colour.
The Laurentian Library, however, was built in 1524.
See Gotti, pp. 150, 155, 158, 159, for the correspondence which passed upon the subject, and the various alterations in the plan. As in the case of all Michael Angelo's works, except the Sistine, only a small portion of the original project was executed.