Everyone has seen a thousand full-grown men. Now if you wish to judge of their normal size, estimating it by means of comparison, the Imagination (as I think) allows a great number of images (perhaps the whole thousand) to fall on one another. If I am allowed to apply here the analogy of optical presentation, it is in the space where most of them are combined and inside the contour, where the place is illuminated with the most vivid colours, that the average size is cognisable; which, both in height and breadth, is equally far removed from the extreme bounds of the greatest and smallest stature. And this is the stature of a beautiful man. (We could arrive at the same thing mechanically, by adding together all thousand magnitudes, heights, breadths, and thicknesses, and dividing the sum by a thousand.