The document discusses the element of line in visual art. It begins by defining different types of lines such as outline, contour, and implied lines. It explores the qualities lines can possess including direction, thickness, and movement. Specific artworks are analyzed to showcase different applications of lines, such as the expressive, loose lines in Van Gogh's The Starry Night compared to the rigid, structured lines of Sol LeWitt's wall drawings. The document also examines how artists such as Hung Liu have used lines and the drip technique in their creative process.