Composition in Colour A is an abstract oil painting created by Piet Mondrian in 1917. The work is identified by its arrangement of colored geometric forms and is signed and dated by the artist in the lower left corner. It belongs to a period in Mondrian’s career when he was moving toward a fully non-representational style, exploring the possibilities of pure abstraction and the use of primary colors and geometric shapes. The painting features a gridless composition of squares in red, blue, and ochre, distributed across a white ground.

The colored squares are interspersed with small black rectangles, which create a sense of rhythm and movement within the otherwise static arrangement. The paint is applied evenly, with the surface showing visible craquelure. The overall effect is one of balance and order, achieved through the careful placement of shapes and the limited palette. This work was produced during Mondrian’s involvement with the De Stijl movement, which he co-founded in 1917.

Composition in Colour A exemplifies the artist’s pursuit of harmony through abstraction, a key principle of the movement. It belongs to the Kröller-Müller Museum in Otterlo.