Furthermore, despite the novel's thematic focus on racial injustice, its black characters are not fully examined. In its use of racial epithets, stereotyped depictions of superstitious blacks, and Calpurnia, who to some critics is an updated version of the "contented slave" motif and to others simply unexplored, the book is viewed as marginalizing black characters. One writer asserts that the use of Scout's narration serves as a convenient mechanism for readers to be innocent and detached from the racial conflict. Scout's voice "functions as the not-me which allows the rest of us—black and white, male and female—to find our relative position in society". A teaching guide for the novel published by The English Journal cautions, "what seems wonderful or powerful to one group of students may seem degrading to another". A Canadian language arts consultant found that the novel resonated well with white students, but that black students found it "demoralizing". Another criticism, articulated by Michael Lind, is that the novel indulges in classist stereotyping and demonization of poor rural "white trash".