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.
The materials he used to paint with is fading away and soon it will be completely gone if it is not repainted on a daily basis.