Balance is not the same as symmetry, but works on the desire for symmetry and the way the viewer observes a visual field to create an analogous sensation, but with varied elements.
For example, an angled line may counteract the natural downwards fall of the gaze. A large, light square will effectively balance a small, dense circular shape. In practice, this may take the form of two bowls placed a certain way in a still-life, or the use of a window-sill to cut across a composition.

