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An observer looking out the side window of a rapidly moving automobile, with a neutral density filter over one eye, sees the world as dwarfed and moving by slowly (Enright, 1970). Enright argued that increased disparity from the Pulfrich effect causes near objects to appear nearer still, so that size constancy requires they be small, and speed constancy that they be moving slowly. However, it is possible the effect results from solving for absolute distance using mutual constraints provided by structure from motion and shape from relative binocular disparity (Richards, 1985; Kellman & Kaiser, 1995). In this case, the three-dimensional scene would retain its original apparent shape, and, critically, the entire scene (not just the near objects) would appear smaller and closer. Previous studies used small displays of isolated objects and failed to find such an effect (Brenner & Landy, 1999).

A reexamination of the Enright (1970) illusion: Distance from motion and stereo?