For folks missing an eye, "manual" parallax is one of the primary ways we do depth perception in real life - you get it for free by having two eyes; we have to

For folks missing an eye, "manual" parallax is one of the primary ways we do depth perception in real life - you get it for free by having two eyes; we have to move our heads around sometimes. =) That's an interesting theory but I think that's not what's happening. For those unfamiliar, the 3DS uses a lenticular screen. It renders two separate images: the "right" and "left" image. The one you see depends on your viewing angle. If my good eye was seeing both images, I believe I'd experience a sort of double vision or as least discontinuities. Perhaps more to the point, the 3D effect disappears if I close my "bad" eye! So my "bad" eye is contributing... somehow.