A few pages of quick studies done to demonstrate certain drawing principles to students. In some cases, they reflect the initial lines that provide a backbone or structure for a sketch to be developed as time permits. In others, they serve to illustrate how to establish proportional relationships, ascertain the horizon line in a scene, or work out the geometry of forms. Regardless of their purpose, the practice of doing these small sketches can contribute to the important development of fluidity of vision and line.