Post-Impressionism is a term used to describe the reaction in the 1880s against Impressionism. It was led by Paul Cézanne, Paul Gauguin, Vincent van Gogh and Georges Seurat. The Post-Impressionists rejected Impressionism's concern with the spontaneous and naturalistic rendering of light and color.
refer to these websites for more info on both illusions 1- thevirtualinstructor.com/hatchingcrosshatching.html 2- www.udel.edu/artfoundations/beg_paintingtechniques.html
