Sandro del Prete
Bullock and Nomad
Although in this illustration the same drawing fragment is visible no less than three times, it undergoes a complete metamorphisis owing to several major additions. At the top, a bullock is resting under a shrub. In the center, a nomad offers a water bag to the bullock, while at the bottom, one can see the expressive face of a scholar. The difference is made by adding the lines to complete the top of his head and forehead.