he walked as if he were a mortal being , with clean naked feet over the wet dirty stones of the florentine street , oblivious to the men who could not see him as he stood now so close to me , letting his wings spread out and then folding them again tight , so that i only saw the high feathered bones of them above his shoulders , which were sloped like those of a young boy his face was brilliantly clean and flushed with all the radiant color fra filippo had painted .