To understand Paul Cézanne is to foresee Cubism. Henceforth we are justified in saying that between this school and previous manifestations there is … - Jean Metzinger

Albert Gleizes did not know Montmartre, had never seen anything of Picasso or Juan Gris, never heard Maurice Princet construct an infinite number of different spaces for the use of painters, but he described to me the absurdity of the museums in which mournful, extravagantly three dimensional crowds threaten to crush the visitor by jumping out of their frames.

But we cannot enjoy in isolation; we wish to dazzle others with that which we daily snatch from the world of sense, and in return we wish others to show us their trophies. From a reciprocity of concessions arise those mixed images, which we hasten to confront with artistic creations in order to compute what they contain of the objective; that is of the purely conventional.

Cézanne showed us forms living in the reality of light; Picasso gives us a material report of their real life in the mind. He establishes a free, mobile perspective, in such a way that the shrewd mathematician Maurice Princet has deduced an entire geometry.