"I Capture the Castle" by Dodie Smith presents a unique perspective on observation and human interaction. The quote, "I like seeing people when they can't see me," reflects a certain delight in anonymity and the freedom it brings. It suggests a sense of curiosity about people's true selves when they are unaware of being watched, highlighting the nuances of human behavior that might otherwise remain concealed.

This sentiment resonates with the overall themes of the novel, which explores coming-of-age experiences and the intricacies of family and romance. Through the protagonist's eyes, we witness the complexities of relationships and the longing for genuine connections, emphasizing the value of both visibility and invisibility in understanding others more deeply.