At this point it may not unprofitably be remarked, that none of the problems offered for solution at S. Lorenzo were in the strictest sense of that word architectural. The façade presented a problem of pure panelling. The ground-plan of the sacristy was fixed in correspondence with Brunelleschi's; and here again the problem resolved itself chiefly into panelling. A builder of genius, working on the library, might indeed have displayed his science and his taste by some beautiful invention adapted to the awkward locality; as Baldassare Peruzzi, in the Palazzo Massimo at Rome, converted the defects of the site into graces by the exquisite turn he gave to the curved portion of the edifice. Still, when the scheme was settled, even the library became more a matter of panelling and internal fittings than of structural design. Nowhere at S. Lorenzo can we affirm that Michelangelo enjoyed, the opportunity of showing what he could achieve in the production of a building independent in itself and planned throughout with a free hand. Had he been a born architect, he would probably have insisted upon constructing the Medicean mausoleum after his own conception instead of repeating Brunelleschi's ground-plan, and he would almost certainly have discovered a more genial solution for the difficulties of the library. But he protested firmly against being considered an architect by inclination or by education. Therefore he accepted the most obvious conditions of each task, and devoted himself to schemes of surface decoration.