To Leonardo a landscape, like a human being, was part of a vast machine, to be understood part by part and, if possible, in the whole. Rocks were not… - Kenneth Clark

It remains true that Michelangelo's intensely personal use of the nude greatly altered its character. He changed it from a means of embodying ideas to a means of expressing emotions; he transformed it from the world of living to the world of becoming. And he projected his world of the imagination with such unequaled artistic power that its shadow fell on every male nude in art for three hundred and fifty years. Painters either imitated his heroic poses and proportions or they reacted against them self-consciously and sought a new repertoire of attitudes in the art of fifth-century Greece. In the nineteenth century the ghost of Michelangelo was still posing the models in art schools.

Conventional nudes based on classical originals could bear no burden of thought or inner life without losing their formal completeness.

Our universe cannot even be stated symbolically. And this touches us all more directly than one might suppose. For example, artists, who have been very little influenced by social systems, have always responded instinctively to latent assumptions about the shape of the universe. The incomprehensibility of our new cosmos seems to me, ultimately, to be the reason for the chaos of modern art.