Here are the titles of my large canvases: 'Bathing Place' (Asnieres) 2 meters / 3 meters, exh. Independants (group) May 15, 1884. New York studies fo… - Georges Seurat

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.

The means of expression is the optical mixture of tones, of tints (of local color and the illuminating color: sun, oil lamp, gas, etc.), that is, of the lights and of their reactions (shadows) following the laws of contrast, of gradation, of irradiation.

Gaiety of tone is the luminous dominant, of tint, the warm dominant, of line, lines above the horizontal
Calmness of tone is the equality of dark and light; of tint, of warm and cool, and the horizontal for line.
Sadness of tone is the dark dominant; of tint, the cool dominant, and of line, downward directions.