Hugo's discovery about the identity of the old toymaker is aided by what?

Hugo's discovery about the identity of the old toymaker is significantly aided by the old automaton. The automaton serves as a key element in the narrative, linking Hugo's quest with the past and the legacy of the toymaker. When Hugo repairs the automaton, it ultimately leads him to discover a message that reveals critical information about the toymaker's identity. This connection emphasizes the themes of creation, nostalgia, and the intricate relationship between past and present.

The other options, while intriguing, do not play as pivotal a role in Hugo's journey. For example, a mysterious map or a hidden letter could suggest adventure or discovery, but they do not provide the same direct and personal connection to the toymaker as the automaton does. The magic book, while potentially enchanting, does not hold the same narrative weight in leading to the revelation of the toymaker's identity. Thus, the automaton stands out as the primary catalyst for Hugo’s understanding of his family's history and the true nature of the old toymaker.