Summary from Wikipedia

Seurat's artistic personality combined qualities that are usually thought of as opposed and incompatible: on the one hand, his extreme and delicate sensibility, on the other, a passion for logical abstraction and an almost mathematical precision of mind.[7] His large-scale work A Sunday Afternoon on the Island of La Grande Jatte (1884–1886) altered the direction of modern art by initiating Neo-Impressionism, and is one of the icons of late 19th-century painting.[8]