"He's commissioned a long article on Juan Gris"
Violin and Checkerboard, 1913, oil on canvas by, en:Juan Gris
Public DomainViolin and Checkerboard, 1913, oil on canvas by, en:Juan Gris - Credit: Original uploader was Cactus.man at en.wikipedia

Spanish painter and sculptor José Victoriano González-Pérez (1887-1927), or Juan Gris, spent most of his artistic career in France.

His work was part of the famous Cubism Movement and he created some of the best examples of this particular style of painting.

Gris experimented with various types of Cubism, including the analytic style and synthetic Cubism. However, he used exuburant splashes of colour in his artwork not seen in that of some of his peers e.g. Picasso and Braque, who produced more monochromatic paintings.