A 1909 oil painting by Piet Mondrian, depicting the Dutch dunes through expressive, non-naturalistic colour and rhythmic brushwork.

Dune IV, painted by Piet Mondrian in 1909, captures a specific period in the artist's career before his transition into the geometric abstraction for which he is widely recognised. During this time, Mondrian spent summers in the coastal town of Domburg, where he produced a series of studies focusing on the dunes and the sea. This work demonstrates his engagement with the Fauvist and Luminist movements, characterised by a departure from naturalistic colour palettes in favour of expressive, non-representational hues. The composition is dominated by sweeping, rhythmic brushstrokes that define the undulating forms of the sand dunes. Mondrian employs a palette of intense oranges, purples, and blues, which creates a sense of energy rather than a literal depiction of the Dutch coastline. The application of paint is thick and visible, revealing the physical process of the artist's hand. By simplifying the forms into broad areas of colour, Mondrian begins to move away from traditional representation, focusing instead on the structural qualities of the scene. This piece offers a glimpse into the experimental nature of Mondrian's early work. It shows his interest in the relationship between colour and form, a concern that would eventually lead him to the reductionist style of his later years. The painting functions as a study of light and movement, where the subject matter serves as a vehicle for exploring the expressive potential of paint on canvas. The absence of fine detail allows the viewer to focus on the interplay of the warm, fiery tones against the cooler, atmospheric blues of the sky. It is a clear example of the artist's early efforts to synthesise his observations of the natural world with a more subjective, emotional approach to painting.