Nostalgia and wistfulness: The story is narrated from the perspective of an adult woman reflecting on her childhood, particularly her bond with Robbie the robot. This creates a sense of longing and nostalgia for a simpler, more innocent time.
Fear and anxiety: The story explores the anxieties surrounding the rise of technology and its potential impact on society. There is a sense of fear and unease regarding robots replacing humans, especially in the context of Gloria's mother's fears and the changing attitude towards Robbie.
Love and affection: The core of the story revolves around the deep and unconditional love between Gloria and Robbie. This theme is conveyed through their playful interactions, their shared experiences, and the emotional pain Gloria experiences when she's separated from him.
Hope and optimism: Despite the anxieties surrounding robots, the story ultimately ends on a hopeful note. The final scene suggests that Robbie's love and companionship continue to resonate with Gloria, even years later, reminding her of the importance of genuine human connection.
Satire and irony: Asimov subtly satirizes the irrational fears and prejudices surrounding technology, particularly those expressed by Gloria's mother. The story highlights the tendency of humans to fear what they don't understand.
Whimsical and playful: Asimov's writing style often incorporates a sense of whimsy and playfulness. The interactions between Gloria and Robbie are filled with childlike innocence and joy, contributing to the overall warmth and endearing nature of the story.
Overall, the tone of "Robbie" is nostalgic, bittersweet, and ultimately hopeful. It celebrates the enduring power of love and companionship while subtly critiquing human fears and anxieties surrounding technological advancements.