During this period, Leonardo produced sketches of defensive structures that closely resemble the layout of the Sforza Castle, including the Ghirlanda and multiple passage systems around it.

During this period, Leonardo produced the drawings of defensive structures that closely resemble the layout of the Sforza Castle, including the Ghirlanda and multiple passage systems.

The duke had commissioned the artist for a painting and during this time, da Vinci created the drawings of defensive structures that closely resemble the layout of the Sforza Castle.

During this period, Leonardo produced the drawings of defensive structures that closely resemble the layout of the Sforza Castle, including the Ghirlanda and multiple passage systems. “It is always ...