Binocular Rivalry

Binocular rivalry is a visual phenomenon that occurs when the eyes (or visual perception) alternately switch between two different images that are being presented to the eyes - particularly images that are being presented together in the form of optical illusions. All of us have probably seen these, most commonly as black and white images that can appear to be different pictures depending on how you look at them. For instance, the Rubin vase image is an example of binocular rivalry. Your visual perception switches from seeing a vase to seeing two people looking at one another. https://en.wikipedia.org/wiki/File:Rubin2.jpg