First, permit me to make a somewhat risky comparison: all works of art are like a window opened upon creation: inside the window there's a kind of transparent screen, across which one can see objects that are more or less deformed, undergoing changes that are more or less perceptible in their lines and colors. These changes are derived from the nature of the screen. Creation is no longer exact or real, but modified by the medium through which its image passes.
Emile Zola in a letter to Anthony Valabrègue, 1864