How does Alice Gerstenberg use imagery in Overtones?

Gerstenberg uses color imagery throughout the play, Overtones. In the opening stage directions, each primitive self wears a gown the same color as their counterpart, but in a darker shade. This assists the audience to visually make the connection between each pair of actresses. She also helps the audience make the distinction between Harriet and Margaret through a clever use of color. She has chosen their costume colors from opposites sides of the color wheel. Purple and green are not directly opposite each other on the wheel because they both share the color blue, and yet the two colors are far enough apart that they provide a strong visual contrast to one another. In other words, purple and green are alike and yet different, just as Margaret and Harriet are. The juxtaposition of these two colors visually emphasizes the themes and relationships contained within the play.