Here in the Bargello it is chiefly that art of the fifteenth century that we see in all its beauty and realism: and though for the proper understanding of it some knowledge of its derivation might seem to be necessary, a knowledge not to be had in the Museo itself, it is really a new impulse in sculpture, different from, though maybe directed by, that older art which we come upon, and may watch there, in its dawn and in its splendour, till with Bandinelli and the pupils of Michelangelo it loses itself in a noisy grandiosity, a futile gesticulation. Realism, I said in speaking of the character of this fifteenth century work, and indeed it is just there that we come upon the very thought of the time. Sculpture is no longer content with mere beauty, it has divined that something is wanting, yes, even in the almost miraculous work of Niccolo Pisano himself; is it only an expression of character, of the passing moment, of movement that is lacking, or something comprising all these things--some indefinable radiance which is very life itself? It is this question which seems to have presented itself to the sculptors of the fifteenth century: and their work is their answer to it. For even as the philosophers and alchemists had sought so patiently for life, for the very essence of it, through all the years of the Middle Age, so art now set out in search of it, the greatest treasure of all, and seems to have found it at last, not hardly or hidden away in some precipitous place of stones, or among the tombs, but as a little child playing among the flowers.