Pointillism is a painting technique out of the Impressionist movement. This technique uses, small spots or points of color, which cause, by juxtaposition, an optical mixture in the eyes of the observer.
In this technique, non-primary colors are generated by the visual effect produced by the proximity of the painted spots to the primary colors.
Eliyahu Mirlis explains that in this theory, mixing the lights of the three primary colors produces more light. So if we mix red, blue, and light green (primary additives) we get something that resembles white light.
Here, landscape painter Eliyahu Mirlis, who is dedicated to exploring new techniques, will share more about this technique. 
It was originally developed by the Neo-Impressionist Georges Seurat, who has had an influence on Mirlis’s painting style. This movement is also associated with Paul Signac and Henri-Edmond Cross.
“When the works are seen from afar, at a certain distance, the points with which the paintings are made, cannot be distinguished. Instead, a visual effect is produced that leads us to perceive other colors,” shares Eliyahu Mirlis.
This means that with the same set of primary colors, pointillists can generate a range of different colors.
The result is sometimes described as brilliant since it is the eye of the beholder that makes the mixture, not the brush.
HOW IS THIS EFFECT EXPLAINED?
According to Mirlis, this effect can be explained through knowledge of the color theory and the effects of additive and subtractive colors.
“Generally when colors are produced by physically mixed pigments, we can speak of the theory of subtractive color in works,” indicates the talented painter Eliyahu Mirlis.
According to this theory, mixing the pigments of the primary colors produces less light. So, if we mix red, blue, and yellow pigments (subtractive primary colors), we get a black color.
On the other hand, when colors, are produced by mixing the color light, then we speak of the additive theory of color in the works.
Eliyahu Mirlis explains that in this theory, mixing the lights of the three primary colors produces more light. So if we mix red, blue, and light green (primary additives) we get something that resembles white light.