There are several reasons why for fifty years or more Donatello's ''David'' had no successors... Another is the inherent restlessness of the Florentine temperament. Apollo is static. His gestures are dignified and calm. But the Florentines loved movement, the more violent the better. The two great masters of the nude in the late ''quattrocento'', Pollaiuolo and Botticelli, are concerned with embodiments of energy or ecstatic motion, with a wrestling Hercules or a flying angel, and only once, in Botticelli's ''St. Sebastian'', achieve a satisfactory nude in repose.〔Kenneth Clark, ''The Nude: A study in ideal form'', 1956, ch. 2, "Apollo."〕