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The effect of a time delay between left & right eye images due to sequential display timing is well documented in research papers. The effect is to convert a flat pendulum motion into a perceived circular motion. Thus if an object is moving left to right (or right to left), the time delay between left & right eye images changes the perceived stereoscopic distance (i.e. the convergence angle between the two eyes is changed such that the pendulum appears closer when moving left and farther when moving right, or vice versa). Stereoscopically, the moving object appears closer or farther than it would if stationary. A panning image would also change apparent distace for the same reason but would be less noticable because there is no reference distance as there is with the background next to a moving object.