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Figure SB1. The three-dimensional vision is a complex phenomenon. For the sake of simplification, we shall consider that the movement of the eyes is coordinated by a reflex, so that the directions of sight (S) and (D) converge toward the object looked at (eyes' convergence). Adaptation also occurs by reflex, namely the fact that the object is clearly seen at a specific distance.

A three-dimensional view of the pyramid is obtained by looking with the left eye toward S and the right eye toward D.

The image obtained on the retina of the left eye is a little different from that obtained on the right eye. In the figure, the pyramid is plotted in perspective, with a dotted line (D-H), so that point C seems to be placed towards the viewer.

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