Answer
Creation of Pointillism, a distinctive painting technique central to Neo-Impressionism, is Paul Signac's significant contribution to the art movement. Pointillism involves applying tiny, distinct dots of various colors side by side, allowing the viewer's eye to blend them optically, creating a more vibrant and luminous visual effect. This innovative technique, pioneered by Signac and Georges Seurat, became a defining characteristic of Neo-Impressionism.