I sought refuge in my schoolbooks, among the flowers of Greek poetry, or the magical figures of geometry. - Jean Metzinger

To understand Paul Cézanne is to foresee Cubism. Henceforth we are justified in saying that between this school and previous manifestations there is only a difference of intensity, and that in order to assure ourselves of this we have only to study the methods of this realism, which, departing from the superficial reality of Courbet, plunges with Cézanne into profound reality, growing luminous as it forces the unknowable to retreat.

Instead of copying Nature, we [ Cubists ] create a 'milieu', of our own, wherein our sentiment can work itself out through a juxtaposition of colors. It is hard to explain it, but it may perhaps be illustrated by analogy of literature and music. Your [ Gelett Burgess is American] Edgar Poe did not attempt to reproduce Nature realistically. Some phase of life suggested an emotion, as that of horror in 'The Fall of the House of Ushur'. That subjective idea he translated into art. He made a composition of it.

If we wished to relate the space of the [Cubist] painters to geometry, we should have to refer it to the non-Euclidean mathematicians; we should have to study, at some length, certain of Riemann's theorems.