Simultaneous Counter-Composition is an oil on canvas painting by Theo van Doesburg, completed before October 1929. The work dates from the final years of van Doesburg’s career, a period marked by his continued exploration of geometric abstraction and his involvement with the De Stijl movement. It reflects the artist’s interest in the principles of dynamic equilibrium and the use of diagonals, which distinguished his later compositions from the orthogonal arrangements typical of early De Stijl. The painting consists of a series of intersecting diagonal bands and geometric shapes rendered in black, white, red, and blue.

The composition is dominated by two wide black diagonal stripes crossing the canvas, interspersed with fields of white, a blue triangle, and areas of vivid red. Thin black lines segment the canvas, creating smaller rectangles and triangles, while the arrangement of color and form emphasizes a sense of movement and balance. The use of primary colors and non-representational forms is characteristic of van Doesburg’s mature style, focusing on the relationship between shape, color, and spatial tension. Simultaneous Counter-Composition is documented in the catalogue of Theo van Doesburg’s works edited by Els Hoek (2000), where it is listed on page 501.

The painting’s creation before October 1929 places it among van Doesburg’s last contributions to abstract art before his death in 1931. While the specific early provenance and exhibition history of this canvas are not detailed here, it stands as a significant example of van Doesburg’s late geometric abstraction.