A powerful example of Abstract Expressionism, this work by Franz Kline features bold, gestural black forms against a stark white background.

Franz Kline, a central figure in the New York School of the 1950s, produced Four Square during a period when his work shifted towards large-scale, gestural abstraction. This piece displays his signature approach to composition, where bold, black forms are applied against a stark white background. The interaction between these two colours creates a sense of structural tension, as the heavy, dark strokes appear to push against the negative space. Kline often drew inspiration from industrial environments and the urban architecture of New York City. While his earlier works were figurative, he moved toward this non-representational style by enlarging small sketches until the forms became monumental. The brushwork in this painting is direct and physical, showing the speed and force with which the artist applied the paint. The edges of the black shapes are rough, revealing the texture of the canvas and the physical reality of the medium itself. Unlike many of his contemporaries who focused on colour field painting, Kline maintained a strict focus on the relationship between line and plane. The composition is balanced through the placement of these heavy forms, which occupy the canvas with a sense of weight and presence. The white areas are not merely background, but active participants in the visual field, defining the boundaries of the black structures. This work represents the artist's interest in the economy of means, where a limited palette and simplified forms communicate a sense of energy and scale. The resulting image is one of clarity and force, stripped of narrative detail to focus entirely on the act of painting and the spatial dynamics of the canvas.