As they start to empty out her wardrobes to sort the clothing into charity shop, or send to Africa, or throw away, the sisters start to laugh together. Teresa seems unaware of the inconsistencies of sending ball gowns to Zimbabwe. They each choose an evening dress and giggle away at the effect, dressing up like children.
The Mercy Seat is not really about September 11th but the analysis of a relationship. The devastation of Manhattan is a backdrop to the play and provides the opportunity for Ben (John Hannah) to divest himself of his obligations and responsibilities to his wife and children. The horror of the tragedy serves to expose the ruthlessness of Ben's self interest. While so many people were being brave here is the ultimate act of cowardice.
Tennessee Williams described this play as, "My most beautiful play since Streetcar, the very heart of my life." That quote has since been criticised as raising expectations of the more modern play which was special to Tennessee Williams because it is about his sister Rose, but likening it to one of the greatest plays of the twentieth century.