Fabric takes on the shape of the object below it, falling in long, triangular folds from points of suspension. Treat these folds like any other three-dimensional object. Every fold will have areas of full light, mid-tone, shadow and reflected light. Folds will cast shadows on areas below them. In the first illustration, the draperies to the lower right fall over a rectangular object and a definite plane break is visible where they change direction.
Study the way the folds hang. The painting on the right is of the same still-life as in Chapter 4, Colour Theory - but this time the cloth covers the entire arrangement. How do the draperies describe the forms underneath them?
While looking at the painting in Chapter 4, study the very shiny satin material which reflects a lot of light. Notice how the reflected lights help to describe the position of one fold in relation to the next.