“Art is harmony. Harmony is the analogy of contrary and of similar elements of tone, of color and of line, conditioned by the dominate key, and under the influence of a particular light, in gay, calm, or sad combinations.”
-- Georges Seurat
Ducksters: Seurat
https://www.ducksters.com/biography/artists/georges_seurat.php
National Gallery
https://www.nationalgallery.org.uk/artists/georges-seurat