Final answer:
The physical appearance of a work of art, including its materials, style, and composition, is known as its formal elements or visual properties.
Step-by-step explanation:
The physical appearance of a work of art, including its materials, style, and composition, is known as its __formal elements__ or __visual properties__. These elements include characteristics such as line, shape, color, space, and texture. They are separate from the artwork's content or story, and they can be used to analyze and understand the visual experience of the artwork.