ow Georges Seurat achieve the goal and style with the painting?

About the style of the painter and the Post-Impressionism. How Georges Seurat achieve the goal and style with the painting? By using formal elements: http://design.sdsu.edu/webfaculty/mansfield/art157/projects/elements.html

Please write about Divisionism and pointillism. They are the techniques which well known with the painter.

Don’t talk about symbol in this essay!