Metzinger was at the center of Cubism both because of his participation and identification of the movement when it first emerged, because of his role as intermediary among the Bateau-Lavoir group and the Section d’Or Cubists, and above all because of his artistic personality. During the First World War Metzinger furthered his role as a leading Cubist with his co-founding of the second phase of the movement, referred to as Crystal Cubism.
He recognized the importance of mathematics in art, through a radical geometrization of form as an underlying architectural basis for his wartime compositions. The establishing of the basis of this new perspective, and the principles upon which an essentially non-representational art could be built, led to La Peinture et ses lois (Painting and its Laws), written by Albert Gleizes in 1922–23. As post-war reconstruction began, a series of exhibitions at Léonce Rosenberg’s Galerie de L’Effort Moderne were to highlight order and allegiance to the aesthetically pure.
The collective phenomenon of Cubism—now in its advanced revisionist form—became part of a widely discussed development in French culture, with Metzinger at its helm. Crystal Cubism was the culmination of a continuous narrowing of scope in the name of a return to order; based upon the observation of the artists relation to nature, rather than on the nature of reality itself. In terms of the separation of culture and life, this period emerges as the most important in the history of Modernism.