Read the excerpt from "A Quilt of a Country." When photographs of the faces of all those who died in the World Trade Center destruction are assembled in one place, it will be possible to trace in the skin color, the shape of the eyes and the noses, the texture of the hair, a map of the world. These are the representatives of a mongrel nation that somehow, at times like this, has one spirit. Like many improbable ideas, when it actually works, it's a wonder. In this excerpt, the word wonder has a______________connotation.