In the way that I make anaglyphs the left and right images are shifted relative to each other so that the same point in both images come together. There may be some perceptual defects that result from this process since the images of each camera focus onto a plane and the angles are slightly distorted. In the following images the chosen focal point is marked with a + and the lines horizontal to them appear to be about the same distance. But just below these lines there appears to be a "ripple" which moves with the focal point. I don't know why this happens of if I am just seeing things but the there are differences between the spacing of MSL Navcams and that of human eyes. It may affect the apparent rotation of the image as seen from different positions. The Navcam stereo baseline is 42.4 cm compare to about 7 cm for humans. One would think that a change in scale wouldn't affect stereoscopic vision but this may not be true. It may be something for psychologists to look into if they haven't done so already.