Piet Mondrian's four diamond-patterned paintings of 1918-19--of which this is the second--mark the artist's final step toward the abstraction of his mature style. Composition in Black and Gray is composed entirely of linear elements that diagonally divide the painting into 256 approximately equal triangular units. Mondrian thickened sections of the horizontal and vertical gray lines to create another pattern, an accent distinct from but in harmony with the overall grid. The canvas (now discolored by age) was rubbed with white paint, so that the grid of the woven fabric would remain apparent. The flickering optical effect of the intersections of the lines suggests their visual source in the starry sky. Mondrian, who began as a post-Impressionist painter working after nature and then integrated the Cubist vocabulary, remained committed to an art that retained a basis in nature. He spoke of these diamond paintings as the key to achieving this goal, as their abstract formal structure metaphorically corresponded to our experience of the sky at night, in which we supply harmony and equilibrium to a seemingly infinite, random field. Ann Temkin, from Philadelphia Museum of Art: Handbook of the Collections (1995), p. 317.

Mondrian is best known as the creator of perhaps the most rigorously abstract paintings of the first half of the twentieth century. His austere approach, which he called Neo-Plasticism, defined a picture plane only by vertical and horizontal lines, and by black, white, and the three primary colors. This style has become a cliché of modernism, its popular translations ranging from couture dresses by Yves Saint-Laurent to oversized beach towels. Less well known, however, is the long road Mondrian traveled to arrive at his signature idiom. The journey began in his schooling at the Royal Academy in Amsterdam and charted a course that only gradually took him from an approach based on observed nature to one of supposedly pure and universal pictorial relationships.

This painting, made when Mondrian was forty-seven, comes on the eve of his invention of Neo-Plasticism. The impact of Cubism had already taken him away from the descriptive colors and rolling contours of his early landscapes. Here Mondrian explored the visual possibilities of working with a regular grid pattern to define an entire painting. He limited his resources to linear elements in dark gray that overlay a thin white wash. Narrow diagonal lines map a network of diamonds echoing the orientation of the stretched canvas, while horizontal and vertical lines divide the diamonds into 256 triangles. The verticals and horizontals vary considerably in thickness as they span the canvas, creating the sensation of intersecting rectangular and square compartments of different shapes and sizes. The result produces an optical illusion of subtle flickering and an animated pictorial architecture that transcends its elementary means. Twentieth Century Painting and Sculpture in the Philadelphia Museum of Art (2000), p. 52.