How does Lanford Wilson use imagery in Burn This?

The image of butterflies pinned to walls and trying to be free is disturbing. The butterfly symbolizes rebirth. The caterpillar must undergo a metamorphosis in order to emerge as its true self: Anna is the same way. The butterflies awaken while Anna is sleeping in the room. She comments on how, wrapped in only a sheet, naked she felt when she went for help. Anna is very much like the butterflies on the wall and throughout the first act, she struggles to be free, but she needs help.