Triangulation requires 3 points; the two eyes add up to two points while the other is the object of interest. The angle
of convergence of the eyes gives the angle made by each eye with respect to the line joining the two eyes. We obviously
know the distance between the two eyes. Hence there exists a unique triangle that can be constructed with the above data.
The point where the two constructed lines meet gives the position of the object. In order to perceive true depth the eyes
should guarantee that the object of interest is at this point. We will see how this is done next.
