A Sunday Afternoon on the Island of La Grande Jatte – 1884 (French: Un dimanche après-midi à l'Île de la Grande Jatte - 1884) is one of Georges Seurat's most famous works, and is an example of pointillism. Georges Seurat spent over two years painting A Sunday Afternoon, focusing meticulously on the landscape of the park. He reworked the original as well as completed numerous preliminary drawings and oil sketches. He would go and sit in the park and make numerous sketches of the various figures in order to perfect their form. He concentrated on the issues of colour, light, and form. The painting is approximately 2 by 3 meters (6 ft 10 in x 10 ft 1 in) in size. Motivated by study in optical and colour theory, Seurat contrasted miniature dots of colors that, through optical unification, form a single hue in the viewer's eye. He believed that this form of painting, called divisionism at the time but now known aspointillism, would make the colors more brilliant and powerful than standard brush strokes. The use of dots of almost uniform size came in the second year of his work on the painting, 1885-86. To make the experience of the painting even more vivid, he surrounded it with a frame of painted dots, which in turn he enclosed with a pure white, wooden frame, which is how the painting is exhibited today at the Art Institute of Chicago. In creating the picture, Seurat employed the then-new pigment zinc yellow (zinc chromate), most visibly for yellow highlights on the lawn in the painting, but also in mixtures with orange and blue pigments. In the century and more since the painting's completion, the zinc yellow has darkened to brown — a colour degeneration that was already showing in the painting in Seurat's lifetime. The island of la Grande Jatte is located at the very gates of Paris, lying in the Seine between Neuilly and Levallois-Perret, in a short distance from where nowadays stands La Defense business district. Although for many years it was an industrial site, it is today the site of a public garden and a housing development. When Seurat began the painting in 1884, the island was a bucolic retreat far from the urban center. The painting was first exhibited in 1886, dominating the second Salon of the Société des Artistes Indépendants, of which Seurat had been a founder in 1884.