What is the effect of making objects in a painting duller that others?

Making certain objects in a painting appear duller can create a sense of depth and focus, guiding the viewer's eye toward more vibrant elements. This technique enhances the contrast between the dull and bright areas, emphasizing the focal points and adding emotional weight to the composition. Additionally, it can evoke a sense of realism by mimicking how light interacts with various surfaces in the real world. Ultimately, this approach contributes to the overall mood and narrative of the artwork.