Book excerpt: Georges Seurat died in 1891, aged only 32, and yet in a career that lasted little more than a decade he revolutionized technique in painting, spearheaded a new movement, Neoimpressionism, and bought a degree of scientific rigour to his investigations of colour that would prove profoundly influential well into the 20th century. As a student at the Ecole des Beaux-Arts, Seurat read Chevreul's 1839 book on the theory of colour and this, along with his own analysis of Delacroix' paintings and the aesthetic observations of scientist Charles Henry, led him to formulate the concept of Divisionism. This was a method of painting around colour contrasts in which shade and tone are built up through dots of paint (pointillism) that emphasise the complex inter-relation of light and shadow.