When might artists use optical color?

Artists might use optical color when they want to create vibrant visual effects by placing colors side by side, allowing the viewer's eye to blend them from a distance. This technique enhances the luminosity and vibrancy of the artwork, as seen in Impressionist and Pointillist styles. By relying on the viewer's perception rather than mixing pigments physically, artists can achieve a more dynamic and engaging composition. Furthermore, optical color can evoke emotional responses and deepen the overall impact of the artwork.