You can read about Seurat at http://en.wikipedia.org/wiki/Georges_Seurat
HIs most famous painting Sunday Afternoon at the Grand Jatte is at end of page, but for more detailed description: http://www.artchive.com/artchive/S/seurat/jatte.jpg.html
The important thing to look for when reading is his study of color and how he applied it - in little dots - Pointillism.
To see how he - a Post-Impressionist - fits in to art movements in Paris of his time, go to http://www.metmuseum.org/TOAH/hd/poim/hd_poim.htm