The Unity of Opposites
A figure can be viewed, and perceived in its most basic form. However, even the most basic perception of a form requires the partnership of the figures background. Which, is not an opposing element in this perception but rather and essential partner creating the unity of opposites.
This image is a wonderful example of the unity of opposites as we see the positive elements only in their true form with the assistance of the background. In order to clearly read this plan view, the background surrounds the positive elements allowing us to perceive the form correctly.