From The Art and Popular Culture Encyclopedia
"Rivoluzione! Italian Modernism from Segantini to Balla - the first comprehensive overview of Divisionism at Kunsthaus Zürich. "...The Divisionists were Italy’s answer to the French Neo-Impressionists and Pointillists, who were in turn the Parisian successors to Impressionism. Adherents of Divisionism analysed colour and light, and applied colour theory and the principles of optics to the work of painting. Their dots and brushstrokes often rendered in complementary, contrasting primary colours, the Divisionists created dazzling compositions flooded with light."--via gmtPlus9 (-15)
The technique involves breaking color into its basic elements, painting in very small and regular dots. From a distance the multiple dots form an optical mixture of color. The best known example is Seurat's A Sunday Afternoon on the Island of La Grande Jatte (1884-1886).
Another, similar, variety of Neo-Impressionism is pointillism, which involves painting in dots, though not necessarily with the aim of breaking colour.
Italian Divisionist painters include Giovanni Segantini, Giuseppe Pellizza da Volpedo, Emilio Longoni, Vittore Grubicy de Dragon, Luigi Russolo, Gaetano Previati, Angelo Morbelli, Filippo Carcano, Plinio Nomellini and Alessio Di Lernia.