The "Grand Tableau" is a comprehensive layout used in the practice of Lenormand card reading. It involves laying out all 36 cards in a specific pattern, typically in a rectangular grid, to provide a detailed overview of a person's life and circumstances. Each card's position and its relationship to others reveal insights into various aspects such as love, career, and health. In a Grand Tableau, readers interpret the cards based on their meanings and the connections between them. This method allows for a holistic view, as it encompasses multiple themes and influences, making it a powerful tool for divination and self-reflection.