Line is one of the fundamental elements of art design. Line usually indicates the edge of a flat shape or a three-dimensional form. Lines can be different in color and widths (constant or varying).

Line art is an image that consists of distinct straight or curved lines.

• A contour drawing presents dimensions, edges, outlines, and shapes.
• A cross contour technique indicates surface of an object, usually in perspective.
• A blind contour technique implemented without looking at the resulting image.
• A continuous line drawing is produced without lifting the implement from the page.
• A fast gesture drawing technique captures the essence of a figure in lines.

Pen and ink artwork made using various inks, including sumi and ecological, and implements like fountain pens, technical, or parallel pens.