Foreshortening is a drawing technique that makes a form look shorter or compressed when it points toward or away from the viewer. It is essential for drawing convincing bodies, limbs, tools, vehicles, and objects in deep space. In a reaching arm, the hand may appear much larger than the shoulder because it is closer to the viewer.
This effect creates drama, depth, and a strong sense of motion on a flat page.
To draw foreshortening well, artists think in simple 3D forms such as cylinders, boxes, spheres, and tapered tubes. The visible length of a form depends on its angle to the viewer, so a limb aimed straight forward may show mostly overlapping cross sections instead of its full length. Perspective lines, centerlines, contour ellipses, and size comparisons help place each part in depth.
Careful observation matters because the brain often tries to draw what it knows, not what the eye actually sees.
Key Facts
- Foreshortening makes objects appear compressed when they point toward or away from the viewer.
- Closer parts appear larger, while farther parts appear smaller.
- Apparent length = true length x cos(theta), where theta is the angle between the object and the picture plane.
- A limb aimed toward the viewer often overlaps itself, with the hand hiding part of the forearm and upper arm.
- Use simple forms first: palm as a box, fingers as cylinders, joints as spheres, and arm sections as tapered cylinders.
- Contour lines and ellipses should wrap around the form to show direction, volume, and depth.
Vocabulary
- Foreshortening
- Foreshortening is the visual compression of an object or body part when it extends toward or away from the viewer.
- Perspective
- Perspective is a system for showing depth and distance on a flat surface.
- Overlap
- Overlap happens when a closer shape covers part of a farther shape, helping show which object is in front.
- Contour line
- A contour line is a line that follows the surface or edge of a form to describe its shape and volume.
- Vanishing point
- A vanishing point is the point where parallel lines appear to meet as they recede into the distance.
Common Mistakes to Avoid
- Drawing the limb at its normal full length, which makes it look flat instead of aimed toward the viewer. Compare the visible length to the true length and shorten it based on the viewing angle.
- Making every part the same size, which removes the depth cue. The hand, wrist, and forearm should usually decrease in size as they move away from the viewer.
- Outlining the arm as one long tube, which ignores joints and overlapping forms. Break the arm into palm, wrist, forearm, elbow, upper arm, and shoulder shapes before adding details.
- Placing contour lines straight across the form, which makes the surface look flat. Curve the lines around the cylinder or box shape to show its direction in space.
Practice Questions
- 1 A forearm is 30 cm long in real life. If it points 60 degrees away from the picture plane, use apparent length = true length x cos(theta) to find its apparent drawn length.
- 2 In a foreshortened arm drawing, the hand is drawn 9 cm wide and the shoulder area is drawn 3 cm wide. What is the size ratio of hand width to shoulder width, and what does that suggest about depth?
- 3 A student draws a reaching arm with a small hand, a long straight forearm, and no overlap between the wrist, forearm, and upper arm. Explain why the drawing may look flat and describe two changes that would make the foreshortening stronger.