According to Sylvan Barnet, the form of an artwork (e. g., the kinds of lines or brushstrokes, the color choices) contributes to the content of the work. It's part of how it conveys its meaning.

the fresco   technique involves painting on a freshly plastered wall and was popular during the greek, roman, medieval, and renaissance periods. fresco painting is the method of painting water-based pigments on freshly applied plaster. it was usually done on wall surfaces.