He almost stopped painting in oils from 1910 until the end of the war. But his few works continued to develop his Neo-Impressionist style.
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The River Seine at Samois, near Fontainebleau, including a steamboat, the River Verdon flowing through the gorge at Castellane, and Mirabeau Bridge in Paris.
In addition to painting one of the major Neo-Impressionist masterpieces showing poplar trees, he built a series of Post-Impressionist pines-beach-bathers of distinction.
From his first influence by Impressionism, van Rysselberghe explored a world of vivid light and colour, painting some of the most distinctive works of the late nineteenth and early twentieth centuries.
The Eclectic Light Company 