Poster illustrating the symbols positive and negative whilst also playing on the idea
of positive and negative space. The same illustration is created twice; once as white imagery on a black background and then the reverse. Although both posters have the same visual information, the eye focuses on different parts of the illustration depending on whether the foreground colour is lighter or darker.
Both a plus sign (+) and negative sign (-) are visible but your eyes will always focus on
one shape before focusing on the other.