On the device of your photographic camera is big eyes: that is drawn on its frosted glass depends on the distance between the lens and remove items. Photographic apparatus secures the plate perspective view, which was presented to our eye (note - one eye!), placed on the spot of the lens. It follows that if we wish to receive a snapshot of the same visual impression, as from the nature, we must:
1) view a picture of only one eye and
2) to keep the picture in proper distance from the eyes.
It is easy to see that, looking at the picture the two eyes, we must inevitably see the flat picture, and not the image that has depth. This need stems from the peculiarities of our sight. When we consider the bodily subject, PA the retinas of our eyes the resulting images are different: the right eye sees is not quite the same, that is drawn to the left.
It seems your finger left and right eye, if you hold your hand close to the face.
This dissimilarity of the images and is, in essence, is the main reason that things seem to us bodily: our consciousness merges both different experiences in one relief image (in this case, as it is known, is based device stereoscope). The other thing is that if you have a flat object, such as the surface of the shore, both eyes are then quite identical impressions; this is the same for consciousness characteristic in-plane length of the subject.
It is now clear what error we get from looking at a picture of two eyes; we impose his mind the belief that the us is a flat picture. When we offer both eyes shot intended only for one , we are distracting ourselves to see that should give us the picture; all illusion, in which the perfection of the created photographic camera, is destroyed by this blunder.