Identifying characteristics of line art drawings include the presence of distinct straight or curved lines against a plain background and lack of gradations in shade and hue. Line art drawings are usually drawn in a realistic style, but other drawing styles include caricatures, cartoons, glyphs and ideographs.
Different kinds of lines are used to create various artistic effects and to express the artist's feelings, inner vision or intent. For instance, geometric lines are utilized for drawings of man-made structures as they convey a sense of conformity, stability and order. On the other hand, organic lines that are curved, fluid and in free-form work best for nature-themed drawings because they project spontaneity and gracefulness. Other line types that identify line art drawings are horizontal, vertical, diagonal and descriptive lines.