More considerate people made a mud brick wall along the original cave wall for their own painting,but rude ones simply plastered a layer of cob over the original mural and daubed it white to make their own painting.

• 粗暴些的则在原壁画上抹一层草泥，然后刷白重新作画。最潦草的是直接在原作上盖一层白粉后便取而代之。