This document discusses the element of line in art. It defines a line as the pathway made when a tool like a pen or pencil is dragged across a surface. Lines can have different qualities like being curved or straight, thick or thin, light or dark, and continuous or broken. There are five main types of lines: vertical, horizontal, diagonal, curved, and zigzag. Artists can combine different line types to create effects, emotions, and movement in their work. The document provides examples of artists like Henry Moore, Käthe Kollwitz, Edgar Degas, Philip Guston, Alberto Giacometti, Jacques Villon, and Pablo Picasso to illustrate the use of lines in different artistic styles.