A line is a mark longer than it is wide. You met line weight and contour in Line Weight and Line Quality. As an element of design, line does several jobs: it outlines shapes, shows direction, leads the eye, and sets a mood.
| Line | Often suggests | Think of |
|---|---|---|
| Horizontal | rest, calm, width | the horizon, a person lying down |
| Vertical | height, stability, reaching up | tree trunks, columns, a person standing |
| Diagonal | movement, energy, tension | a runner leaning forward, a falling tree |
| Curved | gentle flow, softness | rolling hills, a river |
| Zigzag | excitement, sharpness, speed | lightning, a jagged mountain ridge |
Lines do not have to be drawn. An actual line is a real mark. An implied line is one your eye fills in: a row of dots, the edges of shapes that line up, the direction a person is looking, or a shape that points.
Key idea
Line is a mark longer than it is wide, actual or implied. Its direction and character (straight, curved, jagged) shape both where the eye goes and how a picture feels.
Why it works
Our eyes tend to join marks that line up and to continue a direction once it starts. Psychologists call this good continuation. We also follow where a face looks or a hand points. Artists use these habits to steer a viewer without drawing a single extra line.
Worked example: Finding an implied line
In a painting, a woman at a window looks down at a letter on the table. Nothing is drawn between her eyes and the letter. Is there a line there?
- Our eyes follow the direction she looks.
- So the eye travels from her face to the letter.
- That path is an implied line made by her gaze.
Answer: Yes: an implied line, made by her gaze.
Common mistake
Counting only drawn lines. A row of trees, a line of people looking the same way, or the edge where a dark sky meets light hills all guide the eye. When you trace the path your eye takes, include the implied lines.