The technique used to layer paint in fine arts is called "glazing." In this method, a transparent or semi-transparent layer of paint is applied over a dried layer of paint to create depth, luminosity, and complexity in color. Glazing allows artists to build up subtle variations and tonal shifts without obscuring the underlying layers. This technique is commonly used in oil painting, but can also be applied in acrylics or watercolors. Mastery of glazing requires precision and patience, making it a favored approach in classical and contemporary painting to evoke a sense of realism and richness.