Positive/negative shape comparison
Compare the shapes of your subject and its surrounding spaces to check proportion, placement, and angle during a block-in.
What it is
Positive shapes are the objects you draw, such as a figure, chair, or tree. Negative shapes are the spaces around and between those objects, such as the gap between chair legs or branches.
During a block-in, compare the angles, widths, and curves of these spaces with the reference. Check the background shape beside a contour as well as the contour itself, then adjust the drawing until both shapes align with the reference.
Why it matters
Negative-shape comparison provides a second check for proportion, placement, and angle. Weak control can leave errors in the object outline or the spaces around it unnoticed.
You can check it when
- ✓Match the background shapes around a simple reference, such as a chair or standing figure, and compare the result with the subject.
- ✓Compare gaps between limbs, objects, and the picture frame for matching width, height, and tilt. When a block-in looks off, check both the object outline and the negative shape around it.