The Nautilus, a natural expression of the golden ratio, occupies the space of human thought until it merges with the face. Nature and the mind share the same invisible architecture, reminding us that organic growth and artistic creation respond to a universal order. The spiral form of the Nautilus shell was a constant source of inspiration for Gaudí in the design of staircases, vaults, and other architectural elements. He believed that the forms found in nature solve structural problems in the most efficient and beautiful way, making them the perfect model for architecture.