What metaphors are used in Studies in the Park by Anita Desai?

Suno's descriptions of human voices, particularly those of his family members, are especially evocative in their negative connotations. He states that his mother's voice "wheedles its way into my ear like a worm." The metaphor of his mother's voice compared to a worm evokes images of dirt, sliminess, and disgust, especially when one imagines it crawling directly into one's ear.