But the most direct evidence of the influence of Greek art upon Italian artists of the fifteenth and early sixteenth centuries, is to be found in the splendid series of bronze statuettes of the period. In their monumental figures the sculptors were more or less confined in their designs by considerations of portraiture, conventional drapery and symbols, and local requirements, and while they were greatly assisted by Greek experience, yet only rarely were they strictly at liberty except with ornaments and accessories. But in the small bronze figures their fancy could roam at will, and they made good use of this freedom in displaying their ready acceptance of the first principle in the design of the human figure recognized by the Greeks--that the sculptor must arrive at perfection of form if that be possible; that this perfection is not to be found in any single form in life, and consequently the artist must combine perfected parts into a harmonious whole, independently of particular models. The agreement with this principle was general, with scarcely an exception amongst the bronze figure designers, and the result was that in the period say, from 1450 to 1525, there was executed a series of bronzes fully representative of the highest level which plastic art has reached since the greater days of Greece. Right up to the time of the maturity of Michelangelo, nearly every bronze figurine cast is purely Grecian in type, and every ornament, and even every accessory which is not from its nature of contemporary style, can be traced to Greece, either directly or through Rome. Michelangelo brought about a change in accentuating the muscular development of the body, and before the middle of the sixteenth century most sculptors had come under his influence. This was unfortunate for he alone seemed to be capable of harmoniously combining Greek lines with muscular power. A few of his contemporaries, as Sansovino, Leone, Cellini, learned how to join, with due restraint, his innovations with modifications of the Greek torso, but generally the imitation of the great Florentine initiated a decadence, as it was bound to do, for it was accompanied with life modelling, and so meant a radical departure from the Greek forms. Giovanni di Bologna alone among the later sixteenth century sculptors, was strong enough to move in an independent direction. He restrained the accentuation of the muscles, and lightened the Greek type of torso, combining with these conditions an elegance in design which has never since been surpassed.