..the flag is green with a red spot in the center; above, the blue of the sky, the orange-tinted white of the walls, and the orange-grey of the cloud… - Georges Seurat

I painted like that because I wanted to get through to something new - a kind of painting that was my own.

(Rood etait en ma possession le lendemain du jour oil paru la revue biblio graphique de Philippe Gille, collection du Figaro 1881 [changement de palette]. J'abandonne les terres en 82 a 1884. Sur le conseil de Pissarro je lache le verr emeraud (1885)

Opposites are:
for tone, a more luminous/lighter one for a darker one.
for tint, the complementaries, that is, a certain red opposed to its complementary, etc.
Red — Green
Orange — Blue
Yellow — Violet
for line, those making a right angle.