This beautiful work by Sirigatti, published in 1596, brings the tradition of perspective drawing up to Galileo’s time. Sirigatti was a member of the Academy of Drawing (Accademia del Disegno), a school for artists and engineers where Galileo studied as a young man. The work, which was acquired in 2013 through the generous support of the OU Athletics Department, contains 64 full-page engravings with accompanying exercises. Any young artist or mathematician working his way through Sirigatti and learning to create the spikes on a ring diagram such as this would master perspective and the handling of light and shadow (chiaroscuro). Each spike must cast an appropriate shadow, not unlike the patches Galileo would later discern through his “perspective tube” and interpret as the shadows of mountains protruding up from the surface of the Moon.