What is the author's tone in Playing in the Dark: Whiteness and the Literary Imagination by Toni Morrison?

The tone of this novel is first person and objective. The narrator presents her theories, providing samples from popular American literature to support these theories. Her tone is neither judgmental nor critical towards the authors whose works she analyzes. Toni Morrison presents her evidence very factually without any diversion into a sentimental area that could compromise the authenticity of her theories. She argues that race has become a metaphor for many other aspects of human nature.