Piet Mondrian

At first glance, this drawing appears to be totally abstract, despite its descriptive title. In fact, the vertical lines at the base of the oval represent a pier that stretches into an ocean of short horizontal and vertical lines above and around it. At times crossing or lying perpendicular to one another, these lines reflect the rhythmic ebb and flow of the sea, and, with the areas of white paint, the reflected starlight overhead.
Mondrian had begun to experiment with abstraction before 1912, when he left for Paris, where for two years he was exposed to Cubism. He returned to the Netherlands with renewed determination to create a purer abstract form at the expense of more illustrative elements. His highly individual version of Cubism simplified it into a vertical-horizontal grid, in which shading was flattened to the surface to form areas of muted color.
In the Pier and Ocean series of 1914–15, color is eliminated, and the grid opens to form a cluster of "plus-and-minus" signs within a Cubist oval. The reduction to vertical and horizontal generalizes the artist's sources in nature into a symbolic structure representing what Mondrian saw as a cosmic dualism between the masculine and spiritual (vertical) and the feminine and material (horizontal). His system of cruciform signs here speaks to flickering light and movement on water and also to a spiritual structure within nature itself—in his words, "a true vision of reality."