A wall section is a part of a wall that is divided into two or more sections. A PANEL is a flat piece of material, such as wood, metal, or plastic, that is used to cover a wall section. It is usually rectangular in shape and can be used to add texture or color to a wall. A DADO is a groove cut into a wall section, usually for decorative purposes. It is typically found in the middle of a wall section and can be used to create a pattern or to separate two different materials.