This document discusses Post-Impressionism in Europe in the late 19th century. It describes two main trends: Scientific Post-Impressionism exemplified by Seurat and Cézanne, and Lyrical Post-Impressionism represented by Gauguin and Van Gogh. Seurat developed a technique called Pointillism based on new scientific theories of color and vision, applying small dots of pure color that were meant to optically mix in the viewer's eye. His most famous work, A Sunday Afternoon on the Island of La Grande Jatte, exemplifies this technique and took over two years to complete.