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J. Perelman
"Entertaining physics". Book 1.
Chapter 9. Vision one and two eyes


Stereo photo reproduced with us on рисeyrt, depicts polyhedra: one black and white, the other in white and black.

Stereoscopic Shine. Merging when viewed in a stereoscope, these figures give a picture of shiny crystal on a black background.

What we would see if you looked at these pictures in a stereoscope? It is difficult to predict. Listen Helmholtz:

“When one stereoscopic image of any plane is depicted in white, the other black, in the United picture she looks brilliant, even when the picture is taken completely matte paper. Stereoscopic drawings of models of crystals (met) give the impression as if the model crystals made of shiny graphite. Even better, thanks to this technique, stereoscopic photographs, the glitter of the water, leaves, etc.”.

In the old, but far from an outdated book of our great physiologist Sechenov “the Physiology of the senses. Vision” (1867) find a nice explanation of this phenomenon. Here it is:

“In experiments with artificial stereoscopic merge differently lit or differently colored surfaces again the actual conditions of vision, brilliant phone is different Than actually matte surface shiny (polished)? The first reflects the light absently on all sides, so it seems the eye is always covered, from whatever side he looked at her; polished surface reflects light only in a certain direction; it is therefore possible even in such cases, when one eye of the person looking at the surface receives from her many reflected rays, and the other almost none (these conditions and suit the occasion stereoscopic fusion white surface with black); the case of unequal distribution of reflected light between the eyes of the observer (t, i.e. cases where one eye gets more than in the other) when viewed shiny polished surfaces, it is obvious, inevitable.

The reader sees, so that stereoscopic lustre is evidence in favor of the idea that experience plays a dominant role in the bodily act of merging images. The struggle of the field of view immediately gives way to the strong view, as soon as the optic apparatus, educated by experience, are given the opportunity to refer their differences to some friend the occasion of the actual vision.”

Now, the reason that we see the brilliance (at least one reason)is unequal brightness of the images left and right eye. Without a stereoscope this reason hardly could be opened.

Entertaining physics J. Perelman


System Orphus


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