One answer might be found in Radical Harmony: Helene Kröller-Müller’s Neo-Impressionists at the National Gallery. This can be seen both in its selection of works from Helene Kröller-Müller’s Pointillism (or more correctly, Neo-Impressionism) collection, and in the exhibition’s commercial supporters. She amassed 11,500 works and the world’s largest collection of Neo-Impressionism, and acquired 90 works by Vincent van Gogh, often buying directly from the artist and close relatives. Neo-Impressionism is explained as the application of dots of opposing colors together, so that they become more vivid, as opposed to mixing colors on a chromatic scale and applying them with complete freedom of brushstroke. And Georges Lemmen’s 1890 portrait of Jan Toorop varies the size of the “dot,” again to exciting effect.