This chapter is, as the title indicates, all about eyeballs and how they work. We'll use just about everything we've learned so far, plus one or two new things, including how to draw 3-D pictures. You'll be asked to do a number of little projects, one right after the other. They all have to do with how your eyes work, but you might not "see" how until the pieces are all tied together in the next section. In the meantime, get started!