But among these many-sided men, some who may truly be called all-sided, tower above the rest. Before analysing the general phases of life and culture of this period, we may here, on the threshold of the fifteenth century, consider for a moment the figure of one of these giants--Leon Battista Alberti (b. 1404? d. 1472).[306] His biography,[307] which is only a fragment, speaks of him but little as an artist, and makes no mention at all of his great significance in the history of architecture. We shall now see what he was, apart from these special claims to distinction. In all by which praise is won, Leon Battista was from his childhood the first. Of his various gymnastic feats and exercises we read with astonishment how, with his feet together, he could spring over a man’s head; how, in the cathedral, he threw a coin in the air till it was heard to ring against the distant roof; how the wildest horses trembled under him. In three things he desired to appear faultless to others, in walking, in riding, and in speaking. He learned music without a master, and yet his compositions were admired by professional judges. Under the pressure of poverty, he studied both civil and canonical law for many years, till exhaustion brought on a severe illness. In his twenty-fourth year, finding his memory for words weakened, but his sense of facts unimpaired, he set to work at physics and mathematics. And all the while he acquired every sort of accomplishment and dexterity, cross-examining artists, scholars, and artisans of all descriptions, down to the cobblers, about the secrets and peculiarities of their craft. Painting and modelling he practised by the way, and especially excelled in admirable likenesses from memory. Great admiration was excited by his mysterious ‘camera obscura,’[308] in which he showed at one time the stars and the moon rising over rocky hills, at another wide landscapes with mountains and gulfs receding into dim perspective, and with fleets advancing on the waters in shade or sunshine. And that which others created he welcomed joyfully, and held every human achievement which followed the laws of beauty for something almost divine.[309] To all this must be added his literary works, first of all those on art, which are landmarks and authorities of the first order for the Renaissance of Form, especially in architecture; then his Latin prose writings--novels and other works--of which some have been taken for productions of antiquity; his elegies, eclogues, and humorous dinner-speeches. He also wrote an Italian treatise on domestic life[310] in four books; various moral, philosophical, and historical works; and many speeches and poems, including a funeral oration on his dog. Notwithstanding his admiration for the Latin language, he wrote in Italian, and encouraged others to do the same; himself a disciple of Greek science, he maintained the doctrine, that without Christianity the world would wander in a labyrinth of error.