Art is Harmony. Harmony is the analogy of the contrary and of similar elements of tone, of colour and of line. In tone, lighter against darker. In colour, the complementary, red-green, orange-blue, yellow-violet. In line, those that form a right-angle. The frame is in a harmony that opposes those of the tones, colours and lines of the picture, these aspects are considered according to their dominance and under the influence of light, in gay, calm or sad combinations.

-Georges Pierre Seurat-