This document discusses the artistic technique of chiaroscuro used by Leonardo da Vinci and Michelangelo in their drawings. Chiaroscuro uses light and shadow to create the illusion of three-dimensionality. The document examines several drawings by each artist demonstrating their mastery of using shadows, highlights, and gradual value transitions to depict form naturalistically without outlines. It provides background on both artists and their significance in advancing painting techniques during the Italian Renaissance.