Divisionism is a complex system of harmony, an aesthetic rather than a technique.
The point is only a means.
To divide is to seek the power and harmony of color, through representing colored light by pure elements, and through employing the optical mixture of these pure elements, separated and proportioned according to the essential laws of contrast and graduation.
French painter (1863–1935)
Paul Victor Jules Signac (11 November 1863 – 15 August 1935) was a French neo-impressionist painter who, working with Georges Seurat, helped develop the pointillist style.
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Of the three primary colors, the three binary ones are formed. If you add to one of these the primary tone that is its opposite, it cancels it out. This means that you produce the required half-tone. Therefore, adding black is not adding a half-tone, it is soiling the tone whose true half-tone resides in this opposite me have just described. Hence the green shadows found in red. The heads of the two little peasants. The yellow one had purple shadows; the redder and more sanguine one had green ones.
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..it [the large painting 'Bathers at Asnieres', by Georges Seurat was painted in great flat strokes, brushed one over the other, fed by a palette composed, like Delacroix's, of pure and earthy colors. By means of these ochres and browns the picture is deadened, and appears less brilliant than those the impressionists paint with a palette limited to prismatic colors. But the understanding of the laws of contrast, the methodical separation of elements — light, shade, local color, and the interaction of colors — and their proper balance and proportion, give this canvas its perfect harmony.
It seems that the first consideration of a painter who stands before the white canvas should be to decide what curves and arabesques should cut the surface, what tints and tones should cover it.. .Following the precepts of Delacroix he would not begin a composition until he had first determined its organization. Guided by tradition and by science, he would adjust the composition to his conception, that is to say he would adapt the lines (directions and angles), the chiaroscuro (tones), the colors (tints), to the traits he wished to make dominant.
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We have never heard Seurat, Cross, Luce, Van de Velde or indeed Van Rysselberghe or Angrand speak of dots. We have never seen them be preoccupied by Pointillism. Read these lines, dictated by Seurat to Jules Christophe, his biographer: 'Art is harmony; harmony is the analogy between opposites and between similar elements of tone, tint and line. By tone I mean light and dark; tint is red and its complementary: green, orange and its complementary: blue, yellow and its complementary: purple.. .The method of expression relies on the optical mixture of tones, tints and their reactions (shadows that follow very strict rules).
Pissarro wants to achieve delicacy by means of adjustments of nearly like tones; he keeps from juxtaposing two distant tones and does without the vibrant note which such contrast gives, but strives on the contrary to diminish the distance between two tints by introducing into each one of them intermediate elements which he calls 'passage'. But the neo-impressionist technique is based precisely on this type of contrast, for which he feels no need, and on the violent purity of tints which hurts his eye. He has kept of divisionism only the technique, the little dot, whose raison d'etre is exactly that it enables the transcription of this contrast and the conservation of this purity. So it is easy to understand why he [Pissarro] gave up this means, insufficient as it is by itself.
Neo-Impressionist method is an attempt is made to achieve the richness of the sunlight spectrum with all its tones. An orange that blends with yellow and red, a violet that tends toward red and blue, a green between blue and yellow are, with white the sole elements. Through mixture (in the eye of the observer) of these pure colours, whose relationship can be varied at will, from the most brilliant to the greyish. Every brush stroke that is taken from the palette remains pure on the canvas.
Frankly, this is my position: I have been painting for two years, and my only models have been your [ Monet's ] own works; I have been following the wonderful path you broke for us. I have always worked regularly and conscientiously, but without advice or help, for I do not know any impressionist painter who would be able to guide me, living as I am in an environment more or less hostile to what I am doing. And so I fear I may lose my way, and I beg you to let me see you, if only for a short visit. I should be happy to show you five or six studies; perhaps you would tell me what you think of them and give me the advice I need so badly, for the fact is that I have the most horrible doubts, having always worked by myself, without teacher, encouragement, or criticism.