Following the principles of pointillism, Seurat is able to define his shadows not by the traditional black, but by the color that they come into contact with. The women’s skirts represent the best illustration of this: the skirts from the women in the center appear to be forming a blue shadow on the ground. Here the mix of green results in a blue shadow, which does not follow the conventions of shadow forming. The representation and nature of light can be seen most clearly in Gustave Caillebotte’s Paris Street, Rainy Day in the shadows, and the stones of the street itself. Shadows here are also not black. Instead, the stones are made up of several different colors, which mix to create the grey we see, again with the purpose of representing