To consider a preparatory work from 1489 is to gain entry into the meticulous world of Leonardo da Vinci during the High Renaissance. It immediately sparks thoughts about the intense, iterative nature of artistic creation, especially for a project of such ambition. The very idea of a "study" for something as monumental as the Sforza Monument speaks volumes about the struggle to translate grand visions into physical form. Even though its specific medium remains unknown, you can sense the artist grappling with scale, composition, and the engineering challenges of a colossal equestrian statue. We know Da Vinci often explored his concepts with incredible detail, sometimes utilizing methods like silverpoint and ink on prepared papers for other works of the era. Yet this piece exists as a subtle echo of that initial, perhaps most critical, stage. Its current lack of material identification forces you to contemplate the fragile, often temporary life of preparatory sketches and how much of a grand vision is conveyed, or lost, in these earliest moments. What does it mean for such a foundational step to exist, yet its exact physical manifestation be beyond our grasp?