Vergence, a term from the field of optics, refers to the convergence or divergence of light rays. It also designates slow involuntary movements made by the eyes to center an image on the retina. Convergence and divergence determine the stability and definition with which an object is perceived. Such dictionary definitions provide the point of departure for the rhythmic optical game of deception that Tina Frank and Florian Hecker initiate... see more