The Head of the Virgin in Three-Quarter View Facing Right

This manuscript opening features Leonardo's observations on the motion of water, specifically the spirals and eddies formed when a stream falls into a pool. He compares these aquatic patterns to the curling of human hair, illustrating his belief in universal geometric patterns shared across different scales of nature. The pages include dense blocks of Italian mirror-writing and geometric diagrams documenting his findings on optics and natural philosophy.

These studies reflect the Renaissance concept of the 'microcosm and macrocosm,' a central tenet of Neoplatonism where the same laws of motion govern both the human body and the physical universe. Leonardo's investigation into the 'spiral'—a shape he observed in water, hair, and weather—demonstrates his search for a underlying mathematical unity in the living world.