Despite a retinal image that is shifting around with each saccade, despite the visual system taking in discrete “snapshots” of the world, each separated by a small “blank” period of time when we are essentially blind, despite all this, our visual experience is one of smooth, uninterrupted visual continuity. We feel we are seeing the entire scene all of the time. The constant, stable environmental structure that we perceive must somehow be derived from, but can only be partially representative of, a sensory input stream that is noisy and discontinuous.