Dots of Pure Colour: Seurat and the Science of Pointillism

A Sunday and a Revolution

When Georges Seurat exhibited A Sunday on La Grande Jatte — 1884 at the final Impressionist exhibition in 1886, it announced the end of one era and the beginning of another. The painting — more than three metres wide, painstakingly assembled over two years from thousands of tiny dots of pure, unmixed pigment — was the result of a systematic investigation into the science of colour perception.

Seurat had read the chemist Michel Eugène Chevreul and the physicist Ogden Rood. He believed that if complementary colours were placed side by side in tiny dots, the eye would blend them optically, producing a more luminous result than conventional pigment mixing. He called his method Chromoluminarism. His critics called it Pointillism.

How It Works

The technique required extraordinary patience. Each canvas was built up dot by dot, session by session. The colour relationships — orange and blue, violet and yellow, the temperature of shadow and the warmth of direct sun — were calculated rather than felt. Where the Impressionists had trusted sensation, Seurat trusted system.

The result, visible in La Grande Jatte and in the preparatory study Final Study for "Bathers at Asnières", is a peculiar stillness. The figures are frozen, hieratic, as if painted in a medium that has no place for the spontaneous gesture. But in their stillness they shimmer: the eye, performing the optical mixing Seurat designed into the work, sees colour as alive and vibrating.

Legacy

Seurat died in 1891, aged 31. He had completed only seven large paintings. But his influence was enormous: Paul Signac continued and theorised the method; Pissarro briefly adopted it; and its systematic analysis of colour as light laid intellectual groundwork for abstraction. Both La Grande Jatte and the Bathers study can be seen in Beyond the Impression, our autumn catalogue.