divisionism, in painting, the practice of separating colour into individual dots or strokes of pigment. It formed the technical basis for Neo-Impressionism. Following the rules of contemporary colour theory, Neo-Impressionist artists such as Georges Seurat and Paul Signac applied contrasting dots of colour side by side so that, when seen from a distance, these dots would blend and be perceived by the retina as a luminous whole.
Whereas the term divisionism refers to this separation of colour and its optical effects, the term pointillism refers specifically to the technique of applying dots.