Three rectangles of pure colour, one red and one blue, punctuate a field of off-white, each bordered by thick, straight black lines that form a grid across the surface. The red square sits in the upper left corner, its vibrant hue contrasting sharply with the pale ground and the deep black of the lines that contain it. The blue rectangle appears in the lower right, set apart from the red by a wide expanse of white and a network of vertical and horizontal bars.

Most of the composition is filled with white rectangles and squares of varying sizes, their subtle differences in tone and brushwork visible on close inspection. The black lines are painted with deliberate precision, yet their edges reveal slight irregularities and the texture of the brush, suggesting the artist’s hand at work. The lines intersect at right angles, dividing the canvas into a carefully balanced arrangement of geometric forms that neither crowd nor isolate the coloured shapes.

At the bottom left, the initials 'P M' and the numbers '39 – 41' are inscribed in red, standing out against the black bar and hinting at the artist’s signature and a possible date range. The paint is applied smoothly, but faint traces of the brush can be seen in the white areas, adding a subtle texture that catches the light differently across the surface. Each coloured area is opaque and solid, with no visible layering or blending, emphasizing the clarity and separation of each element.

The composition is vertical, with the majority of the grid’s rectangles stretching upward, reinforcing a sense of order and stability. Composition with Red and Blue is the work of Piet Mondrian, whose name and the title are given in the catalogue.