Piet Mondrian
Paris (1918–1938)

When World War I ended in 1918, Mondrian returned to France, where he would remain until 1938. Immersed in post-war Paris culture of artistic innovation, he flourished and fully embraced the art of pure abstraction for the rest of his life. Mondrian began producing grid-based paintings in late 1919, and in 1920, the style for which he came to be renowned began to appear.

Mondrian believed that "pure abstract art becomes completely emancipated, free of naturalistic appearances. It is no longer natural harmony but creates equivalent relationships. The realization of equivalent relationships is of the highest importance for life.

In the early paintings of this style, the lines delineating the rectangular forms are relatively thin, and they are gray, not black. The lines also tend to fade as they approach the edge of the painting, rather than stopping abruptly. The forms themselves, smaller and more numerous than in later paintings, are filled with primary colors, black, or gray, and nearly all of them are colored; only a few are left white.

During late 1920 and 1921, Mondrian's paintings arrive at what is to casual observers their definitive and mature form. Thick black lines now separate the forms, which are larger and fewer in number, and more of the forms are left white. This was not the culmination of his artistic evolution, however. Although the refinements became subtler, Mondrian's work continued to evolve during his years in Paris.

In the 1921 paintings, many, though not all, of the black lines stop short at a seemingly arbitrary distance from the edge of the canvas, although the divisions between the rectangular forms remain intact. Here, too, the rectangular forms remain mostly colored. As the years passed and Mondrian's work evolved further, he began extending all of the lines to the edges of the canvas, and he began to use fewer and fewer colored forms, favoring white instead.

These tendencies are particularly obvious in the "lozenge" works that Mondrian began producing with regularity in the mid-1920s. The "lozenge" paintings are square canvases tilted 45 degrees, so that they have a diamond shape. Typical of these is Schilderij No. 1: Lozenge With Two Lines and Blue (1926). One of the most minimal of Mondrian's canvases, this painting consists only of two black, perpendicular lines and a small blue triangular form. The lines extend all the way to the edges of the canvas, almost giving the impression that the painting is a fragment of a larger work.

Although one's view of the painting is hampered by the glass protecting it, and by the toll that age and handling have obviously taken on the canvas, a close examination of this painting begins to reveal something of the artist's method. The painting is not composed of perfectly flat planes of color, as one might expect. Subtle brush strokes are evident throughout. The artist appears to have used different techniques for the various elements. The black lines are the flattest elements, with the least depth. The colored forms have the most obvious brush strokes, all running in one direction. Most interesting, however, are the white forms, which clearly have been painted in layers, using brush strokes running in different directions. This generates a greater sense of depth in the white forms so that they appear to overwhelm the lines and the colors, which indeed they were doing, as Mondrian's paintings of this period came to be increasingly dominated by white space.

In 1926, Katherine Dreier, co-founder of New York City's Society of Independent Artists (along with Marcel Duchamp and Man Ray), visited Piet Mondrian's studio in Paris and acquired one of his diamond compositions, Painting I. This was then shown during an exhibition organized by the Society of Independent Artists in the Brooklyn Museum – the first major exhibition of modern art in America since the Armory Show. She stated in the catalog that "Holland has produced three great painters who, though a logical expression of their own country, rose above it through the vigor of their personality – the first was Rembrandt, the second was Van Gogh, and the third is Mondrian."

As the years progressed, lines began to take precedence over forms in Mondrian's paintings. In the 1930s, he began to use thinner lines and double lines more frequently, punctuated with a few small colored forms, if any at all. Double lines particularly excited Mondrian, for he believed they offered his paintings a new dynamism which he was eager to explore. The introduction of the double line in his work was influenced by the work of his friend and contemporary Marlow Moss.

From 1934 to 1935, three of Mondrian's paintings were exhibited as part of the "Abstract and Concrete" exhibitions in the UK at Oxford, London, and Liverpool.
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